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      01-06-2012, 06:15 PM   #1
leebske
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Remove Cats instead of buying X-Pipe?

Could anyone please tell me whether i'm right in saying that I would get a similar effect and sound in getting a performance shop to remove the cats from my stock x-pipe as opposed to buying a challenge x-pipe?

Thanks
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      01-06-2012, 06:19 PM   #2
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Yes it would be the same.
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      01-06-2012, 06:24 PM   #3
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Any reason why this isn't done more common instead?

As to remove the cats it would cost no more than $100 for a welder to do and a challenge x-pipe is more like 1000?
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      01-06-2012, 06:29 PM   #4
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One reason would be that for cars on lease, you can't really go cutting and welding parts off and on. The dealer would murder you on a lease return that had the exhaust system butchered.

My logic for getting a catless AA x-pipe and not just hacking them off, was to ensure I could put the car back to stock 100% IF I ever sold it....but that's not happening any time soon
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      01-06-2012, 06:48 PM   #5
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Quote:
Originally Posted by schnell325
One reason would be that for cars on lease, you can't really go cutting and welding parts off and on. The dealer would murder you on a lease return that had the exhaust system butchered.

My logic for getting a catless AA x-pipe and not just hacking them off, was to ensure I could put the car back to stock 100% IF I ever sold it....but that's not happening any time soon
This.
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      01-06-2012, 06:51 PM   #6
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^ what they said + some places here won't cut your cats off because its not legal.
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      01-06-2012, 07:47 PM   #7
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if you can find a shop that will remove the four stock cats and tig weld in four sections of stainless for $100, you should do it.

Performance wise, I agree there is likely little gain from an aftermarket x-pipe over a well-modified stock x-pipe.

I also agree that I do not want to irreversibly hack my stock midpipe. I bought an aftermarket one for that reason.
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      01-06-2012, 10:55 PM   #8
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Wrong section to post in as well, mods will proly move this thread pretty soon..
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      01-07-2012, 03:47 AM   #9
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Quote:
Originally Posted by schnell325 View Post
One reason would be that for cars on lease, you can't really go cutting and welding parts off and on. The dealer would murder you on a lease return that had the exhaust system butchered.

My logic for getting a catless AA x-pipe and not just hacking them off, was to ensure I could put the car back to stock 100% IF I ever sold it....but that's not happening any time soon
I saw a rewelded OEM xpipe that was re-welded with good precision, I doubt the dealer would even know. If itis just the primary cats that are cut and it was a good clean cut you could return it to stock and get away with it.
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      01-07-2012, 04:22 AM   #10
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To each their own. To the OP, see if anyone around you is willing to part with their OE d-pipe..... Mess with it and keep your OE one for later!
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      01-07-2012, 12:33 PM   #11
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A catless stock x pipe sounds pretty horrible though. Lots of backfires and sputtering through the factory resonators. The power is probably within 5whp but the sound with a good x pipe that is x'd towards the front of the car sounds fantastic.
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      01-07-2012, 01:01 PM   #12
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I just had the top of primary cats removed, inside gutted, then top pieces welded back on. No cuts to the piping, looks totally stock from underneath the car when remounted.

I'm in SC where there is no yearly inspection which is nice.
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      01-08-2012, 07:10 PM   #13
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Quote:
Originally Posted by DemonEye View Post
I just had the top of primary cats removed, inside gutted, then top pieces welded back on. No cuts to the piping, looks totally stock from underneath the car when remounted.

I'm in SC where there is no yearly inspection which is nice.
How does it sound?

IT's a lot cheaper to go my route and i don't really see the issue?

I understand the lightness and better construction but I still feel the significant cost saving is tempting?
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      01-08-2012, 07:17 PM   #14
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Sounds a bit louder and meaner when you floor it. Not a huge difference though. The secondary cats and resonators still keep things under control sound wise.
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      01-10-2012, 11:59 AM   #15
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Is it easy to remove secondary cats or resonators to make it louder?
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      01-11-2012, 03:46 PM   #16
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purchase a used stock xpipe without the primary cats and weld either a Turner test pipe or have a shop custom a piece for you. The stock xpipe will retain the secondary cats which help with the exhaust smell and there is no difference in power when compared to an aftermarket piece that cost $1000+. You will still save some dollars. Some just buy parts because they have the money to burn, I would rather save mine $$$$$ just my 2cents
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      01-11-2012, 06:57 PM   #17
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Quote:
Originally Posted by schnell325 View Post
To each their own. To the OP, see if anyone around you is willing to part with their OE d-pipe..... Mess with it and keep your OE one for later!
I did just what you suggested, I bought a used OEM midsection. It was after this I saw a OEM pipe returned to OEM & saw how well it went I then realized if done properly you didnt need to buy a used OEM pipe.

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      01-11-2012, 06:58 PM   #18
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Quote:
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purchase a used stock xpipe without cats and weld either a Turner test pipe or have a shop custom a piece for you. The stock xpipe will retain the secondary cats wich help with the exhaust smell and there is no difference in power when compared to a after market piece that cost $1000+. You will still save some dollars. Some just buy parts because they have the money to burn, I would rather save mine $$$$$ just my 2cents
This...
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      01-12-2012, 09:54 AM   #19
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Quote:
Originally Posted by leebske View Post
Is it easy to remove secondary cats or resonators to make it louder?
Yes, it's a simple bang the material out of the pipe and make good. I'm sure there is a DIY on this forum. If not there is one on m3cutters.
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      01-12-2012, 03:20 PM   #20
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I like the AA x pipe since you can swap the front sections pretty easily.

I do plan to get another AA x-pipe. Buy an extra front section and weld in the OEM cats. Use that section for the street and inspections. Use the straight pipe for the track or whenever it feel the need.
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      01-13-2012, 07:33 PM   #21
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Has anyone had any experience with this product?

http://www.ebay.com/itm/FULL-T-304-S...item2eba777807
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      01-13-2012, 08:59 PM   #22
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I bought the apparently identical one sold by Top Speed. It fit fine, but is too loud for me so I am modifying it to add four resonators. I know it did not cost $1000 or more like some of the other x-pipes but the quality looks fine to me. I hope to tack weld the resonators in place this weekend and then have them tig welded next week.

After that, I will consider whether to add a pair of high flow metallic core 200 cell cats. I would put the high flow cats where the factory primary cats are located and use 02 extenders with restrictors in the hopes that OBD2 readiness would be preserved. Many x-pipes have high flow cats where the factory secondary cats are located and this prevents OBD2 readiness since the rear 02s would be located before rather than after the cats.

I bought the car as a practical daily driver that my wife would ride in since she does not really like my 500+ rwhp 500+ lb rwtq catless turbo E36 M3. If I make the E90M3 too loud and too smelly, she won't ride in it, either.
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