The Ultimate BimmerWorld Xpipe Solution

[//steve\\]

^That's not any more forward than any other "standard" Xpipe. the X would need to be in front of those cats to be a forward X design.

[DrFerry]

Correct. It's why I started the above post with the words, "a very close". Since as far as I know there are no more X-Pipes available with a down pipe crossover X in front of the secondaries. I think the M3World solution is still very good even without the forward X-crossover pressure balancer. I'll remove the word equivalent.

[AmuroRay]

Same as the other stuff, not worth it. buy the X pipe and have a good shop fabricate the rest

[Hein Jockins]

Did anyone have difficulty getting the provided brackets to bolt back to the headers when connecting the bimmerworld pipe to stock exhaust manifold? It's almost as if the provided brackets needed to be slightly wider so you could slide them further up the xpipe to the headers.

I was able to bolt down one side after hours of fooling around with it, but I could only get one of the E12 bolts on the passenger side. Seems secure enough but I don't want to leave it like this.

Never installed an xpipe or done much exhaust work before, so I imagine it's user error.

I circled in red where those sliding brackets gave me difficulty

[//steve\\]

Originally Posted by Hein Jockins

Did anyone have difficulty getting the provided brackets to bolt back to the headers when connecting the bimmerworld pipe to stock exhaust manifold? It's almost as if the provided brackets needed to be slightly wider so you could slide them further up the xpipe to the headers.

I was able to bolt down one side after hours of fooling around with it, but I could only get one of the E12 bolts on the passenger side. Seems secure enough but I don't want to leave it like this.

Never installed an xpipe or done much exhaust work before, so I imagine it's user error.

I circled in red where those sliding brackets gave me difficulty

I found it to be quite a headache too.....definitely much more of a pain than OE or my previous Supersprint. My guess is part of it has to due with the front pipes not being perfectly aligned to the X portion. I'm going to pull it and try to tweak fitment in the near future.

[Hein Jockins]

Originally Posted by //steve\\

I found it to be quite a headache too.....definitely much more of a pain than OE or my previous Supersprint. My guess is part of it has to due with the front pipes not being perfectly aligned to the X portion. I'm going to pull it and try to tweak fitment in the near future.

Somewhat refreshing to know you also found it difficult. Yeah I definitely think it's the front pipes just cause that's really the only variable that can be adjusted. Other than the bracket which was slid all the way to the top and beaten with a hammer to try to squeeze and extra mm out of it. I was at the point where I said "impossible..." Going to get my mechanic to give it a shot.

[Gossypiboma]

Originally Posted by Hein Jockins

Did anyone have difficulty getting the provided brackets to bolt back to the headers when connecting the bimmerworld pipe to stock exhaust manifold? It's almost as if the provided brackets needed to be slightly wider so you could slide them further up the xpipe to the headers.

I was able to bolt down one side after hours of fooling around with it, but I could only get one of the E12 bolts on the passenger side. Seems secure enough but I don't want to leave it like this.

Never installed an xpipe or done much exhaust work before, so I imagine it's user error.

I circled in red where those sliding brackets gave me difficulty

When I last installed one of these I noticed the header connection wasn't fitting correctly and it turns out it was because the rotation at the slip joint before the X wasn't correct. Try loosening that slip connection and rotate/move the front pipe around until the header connection fits correctly.

[Hein Jockins]

Originally Posted by Gossypiboma

When I last installed one of these I noticed the header connection wasn't fitting correctly and it turns out it was because the rotation at the slip joint before the X wasn't correct. Try loosening that slip connection and rotate/move the front pipe around until the header connection fits correctly.

That's what I'm thinking it is solely because that's the only adjustable part. Felt like I exhausted it cause the pipe was sitting flush with the header connection, yet the bracket would not get close enough to bolt.

Anyhow, thanks for the input--I'm optimistic now that my mechanic can get this figured out especially since he last a lift.

[x Spades x]

Originally Posted by drwankel

That video is the best sounding S65 exhaust period. Fairly positive the really long resonators on the ESS x pipe is the secret.

Well that and the two extra small resonators on the Corsa connecting pipe.

[x Spades x]

Originally Posted by Hein Jockins

That's what I'm thinking it is solely because that's the only adjustable part. Felt like I exhausted it cause the pipe was sitting flush with the header connection, yet the bracket would not get close enough to bolt.

Anyhow, thanks for the input--I'm optimistic now that my mechanic can get this figured out especially since he last a lift.

Exactly. Loosen up this joint, go upward and fit the header portion. Once that's done, adjust the rest o the exhaust piping and tighten (down to exhaust).

[cmichaelo]

This thread

Am seriously considering the BW Xpipe w/resonators and welding in a cat pair after the X

Was looking at GESI products and they seem to only have 300 and 400 cpsi cats.

https://gsportbygesi.com/high-perfor...tems-products/

Ideally I would probably want a 200 cpsi cat to get as much HP benefit while still being somewhat environmentally friendly.

If GESI can't be had in 200 cpsi, but only in 300, what really is the HP difference between 200 and 300 cpsi, or 100 cpsi for that matter, in the 2ndary position?

[AmuroRay]

Originally Posted by cmichaelo

This thread

Am seriously considering the BW Xpipe w/resonators and welding in a cat pair after the X

Was looking at GESI products and they seem to only have 300 and 400 cpsi cats.

https://gsportbygesi.com/high-perfor...tems-products/

Ideally I would probably want a 200 cpsi cat to get as much HP benefit while still being somewhat environmentally friendly.

If GESI can't be had in 200 cpsi, but only in 300, what really is the HP difference between 200 and 300 cpsi, or 100 cpsi for that matter, in the 2ndary position?

Probably not too much of a difference in power, but the cost difference between a Gesi and something like a Magnafloe Universal high flow, will be due to the useage of precious metals, which make it more efficient at converting the gasses.

[cmichaelo]

Originally Posted by AmuroRay

Probably not too much of a difference in power, but the cost difference between a Gesi and something like a Magnafloe Universal high flow, will be due to the useage of precious metals, which make it more efficient at converting the gasses.

Has anyone heard about these 100 cpi cats from HPA -> https://www.hpamotorsports.com/colle...ter-x-4-5-long

It's $225 just for the core with 2y/40k warranty and 1500deg max.

Seems like a perfect candidate to put as primary cat as it will at least do some cleaning up and is probably very close to catless wrt HP gains.

[cmichaelo]

Originally Posted by rjsiciliano

I have the valvetronic forward x pipe and this thread peaked my interest. Want to add a second set of resonators but based on the design of this x pipe not sure they would fit in the secondary position. Can anyone comment if you think a shop could fit two resonators or am I SOL?

The Valvetronic X-pipe seems near identical in design to the BW pipe as can be seen from this pic of their latest version which also has a full forward X-over:



I can imagine it would be a lot easier to obtain this pipe than BW's pipe since BW is just anal about preventing non-race usage of their pipe.

[x Spades x]

Originally Posted by cmichaelo

This thread

Am seriously considering the BW Xpipe w/resonators and welding in a cat pair after the X

Was looking at GESI products and they seem to only have 300 and 400 cpsi cats.

https://gsportbygesi.com/high-perfor...tems-products/

Ideally I would probably want a 200 cpsi cat to get as much HP benefit while still being somewhat environmentally friendly.

If GESI can't be had in 200 cpsi, but only in 300, what really is the HP difference between 200 and 300 cpsi, or 100 cpsi for that matter, in the 2ndary position?

The Gesi 300 flow just as good as the 200. You won't find anymore 200 cell cats, as regulations have put an end to those. I would only do those of HJS

[kyrix1st]

$200 each for Gesi 10025? I need two of these right?

Originally Posted by CravingBavaria

I'm going to throw my hat into the ring here. I finally got my setup finished and can relate to this thread lol.

I've had the axle-back for awhile. It's a GRWA valved exhaust, literally no different than Bomiz besides not having branding (so a plus).

The x-pipe is Bimmerworld with the stock Magnaflow resonators, and GESi 10025 in the secondary slot.

I've driven about 200 miles on this setup and wanted to provide my thoughts to help anyone thinking about it. I keep valves open since it honestly sounds weird with them closed, but it's good for being lowkey.

When the car is cold, it sounds more raspy. I don't know if I can really prove this, but the "rasp" seems to go away when it warms up. Now I have to say that this was my impression being inside the car. I never thought it was TOO raspy, but there was some rasp giving it gas at particular RPM's. Also, it doesn't really drone. Windows up cruising on the freeway, it's very manageable. Windows down you can sometimes catch some drone around 3k, but it's something I wasn't even going to mention because I forgot about it.

Now once I heard the car from the OUTSIDE, I think it sounds freakin' incredible. It doesn't sound raspy, it sounds throaty and exotic.

I'm going to have an active Youtube channel coming up here soon (New Years resolution), but wanted to get a quick video linked here for you guys that want to hear it.

One question I do have for those in the know, if I ever did want to swap over to those Vibrant 12" resonators, is there enough space for them after cutting the stock Magnaflow resonators out? Looks like a tight squeeze...

Enjoy and let me know if you have any questions!!

[bananabun]

Originally Posted by cmichaelo

The Valvetronic X-pipe seems near identical in design to the BW pipe as can be seen from this pic of their latest version which also has a full forward X-over:



I can imagine it would be a lot easier to obtain this pipe than BW's pipe since BW is just anal about preventing non-race usage of their pipe.

I came across this recently, too. Definitely seems like the best choice currently, but I wonder if it will hold up to track usage. Also doesn't seem to have resonators so def expect drone and a loud volume.

[AmuroRay]

Originally Posted by bananabun

I came across this recently, too. Definitely seems like the best choice currently, but I wonder if it will hold up to track usage. Also doesn't seem to have resonators so def expect drone and a loud volume.

I would get a resonated section 2 if you really wanted one.

[kyrix1st]

A noob question. If you wanted to add HFCs to the BW x-pipe, do you guys to drive to the exhaust shop WITH the straight pipe on? Not sure how the shop will be able to accurately correctly weld in the cats otherwise.

I am asking if it is better to bring the whole car with the x pipe already installed on the car or just bring it separately and leave them to weld in the cats, trusting their measurements.

[DRLane]

Originally Posted by kyrix1st

A noob question. If you wanted to add HFCs to the BW x-pipe, do you guys to drive to the exhaust shop WITH the straight pipe on? Not sure how the shop will be able to accurately correctly weld in the cats otherwise, can't trust them to eyeball.

I would bring just the front pieces. Mark the alignment before cutting. Chop the piece comparable to the length of the CAT. Weld in per alignment.

[kyrix1st]

Originally Posted by DRLane

I would bring just the front pieces. Mark the alignment before cutting. Chop the piece comparable to the length of the CAT. Weld in per alignment.

I'm adding cats at the secondary location. That's the whole point of the build!

[DRLane]

Originally Posted by kyrix1st

I'm adding cats at the secondary location. That's the whole point of the build!

Same process.