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      08-18-2022, 10:11 AM   #1
nsogiba
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Making straight pipes using the OEM catback

A year ago MPizza gave me an axleback exhaust that he no longer wanted. Recently I was looking for a quick weekend project and wanted to whip up a new exhaust for primarily track use that was much lighter and louder than the stocker. Time to get out the cutoff wheels.





Obviously someone had been inside the can before, and also had hacked off/rewelded the can to the connecting pipes. No clue why someone would do this but it made for a good candidate to be chopped up.





Inside was a rather mediocre 2 pipe mod done, with tons of gaps in the welds and some sections entirely missing weld around the perimeter of the pipe.



The mythical see-through E92 M3 exhaust.



Originally I wanted to just do the ACM mod on this exhaust for full volume, but once I realized how much additional work I'd have to put into welding up all the connecting pipes from the crappy 2 pipe mod I realized it was just easier to cut out everything that wasn't a straight pipe, including the main case of the muffler.

I cut everything else off, leaving only the OEM tips and the seam connecting them as well as the rear central hanger. No sense in adding more bracing if the OEM hangers work fine. The purpose of leaving the seam connecting the 2 pairs of pipes also served as a perfect jig for making sure the tips fit like OEM within the bumper. Since the tip assembly was a bit front heavy, I cut up some plywood shims for placement and temporarily zip tied it in place so I could start the straight pipe portion.



Time to connect the dots.





I used leftover 2.5" piping from other projects to connect the front section to the tips and welded everything up. It was getting late on a Saturday at this point and I was working on my back in the driveway, so no photos. Really need to finish up the LS Jag which has been tying up my lift for the better part of a year.

Final product all welded up and ready for paint:


With a couple coats of high temp paint, ready for track work. I didn't weigh the final product but it's in the neighborhood of 10-15 lbs, which saves quite a bit over the stock 55lb axleback while providing a nice shriek on track. The OEM tips are a nice touch as well IMO.

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      08-18-2022, 11:06 AM   #2
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Muffler deletes sound terrible on this platform imo.

It's hard to make an S65 sound bad, but that is 1 way.
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      08-18-2022, 12:46 PM   #3
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Is it the most refined setup? No...but for track use, with test pipes and stock x-pipe/secondary cats it's much better than the silent OEM exhaust. To each his own.
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      08-18-2022, 02:46 PM   #4
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Quote:
Originally Posted by tdott View Post
Muffler deletes sound terrible on this platform imo.

It's hard to make an S65 sound bad, but that is 1 way.
Not too hard
This x-pipe https://www.ebay.de/itm/334123799378...IAAOSwQQNhI8P0 sounds ugly and rasp with MPE, Meistershaft GT, little better w/OEM but quite good with Supersprint race, unfortunately there noticeable drone.
They listed catless x-pipe 399EUR on spring (now 799EUR) but sent w/primary cats. Maybe i'll write some review later about ebay quality product but now as price is 2x higher less point for buyer suggestion.
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      08-18-2022, 03:27 PM   #5
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Quote:
Originally Posted by m3s65b4.x View Post
Not too hard
This x-pipe https://www.ebay.de/itm/334123799378...IAAOSwQQNhI8P0 sounds ugly and rasp with MPE, Meistershaft GT, little better w/OEM but quite good with Supersprint race, unfortunately there noticeable drone.
They listed catless x-pipe 399EUR on spring (now 799EUR) but sent w/primary cats. Maybe i'll write some review later about ebay quality product but now as price is 2x higher less point for buyer suggestion.
Looks like it came from the same factory as the early Valvetronic xpipe with fake merge, probably why it sounds bad. Catless it barely made more power than full catted stock car. Test pipes made more power.
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      08-18-2022, 09:58 PM   #6
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Quote:
Originally Posted by tdott View Post
Quote:
Originally Posted by m3s65b4.x View Post
Not too hard
This x-pipe https://www.ebay.de/itm/334123799378...IAAOSwQQNhI8P0 sounds ugly and rasp with MPE, Meistershaft GT, little better w/OEM but quite good with Supersprint race, unfortunately there noticeable drone.
They listed catless x-pipe 399EUR on spring (now 799EUR) but sent w/primary cats. Maybe i'll write some review later about ebay quality product but now as price is 2x higher less point for buyer suggestion.
Looks like it came from the same factory as the early Valvetronic xpipe with fake merge, probably why it sounds bad. Catless it barely made more power than full catted stock car. Test pipes made more power.
Boggles my mind why people continue to support a company that drop ships exhausts from China and marks them up 2x. It's one thing to do that then another to claim the product is made in the US when it is not.

People please stop putting Chinese parts on your m3. This includes carbon fiber aero.
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      08-19-2022, 03:34 PM   #7
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I had very similar pipes for less than 24 hrs, while the weight savings was nice, the drone was unbearable.
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      08-25-2022, 07:06 AM   #8
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Quote:
Originally Posted by M43S7RO View Post
I had very similar pipes for less than 24 hrs, while the weight savings was nice, the drone was unbearable.
I'm doing some research right now to fab up some 1/4 wave drone eliminators. Working on finding the right frequency and RPM to target.
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      08-26-2022, 08:53 AM   #9
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Some people likes their car loud and bassy, come likes their cars to be silent and comfy. try different things and stick with the one which you likes the most.
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