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      12-09-2011, 03:11 AM   #1
scotsman
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Cheapest Xpipe

Looking to buy a X-pipe but don't want to spend an arm leg and kidney. So what is the cheapest X-pipe that doesn't throw a CEL? I already have an Eisenmann Sport exhaust.
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      12-09-2011, 07:12 AM   #2
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Stock xpipe flows well. Just buy turner test pipes.
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      12-09-2011, 08:15 AM   #3
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      12-09-2011, 08:55 AM   #4
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sosi x-pipe is dirt cheap for our cars but it retains the primary cats so no major jump in power. Also no CEL
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      12-09-2011, 11:22 AM   #5
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Quote:
Originally Posted by 1SICKM View Post
Stock xpipe flows well. Just buy turner test pipes.
THIS>.....
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      12-09-2011, 11:49 AM   #6
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Won't test pipes throw a cel? I know secondary cats remain but I thought if primaries are gone = cel. I'm adding test pipes very soon, 300 miles to go on break-in. Doing an AA tune too.
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      12-09-2011, 11:58 AM   #7
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Won't test pipes throw a cel? I know secondary cats remain but I thought if primaries are gone = cel. I'm adding test pipes very soon, 300 miles to go on break-in. Doing an AA tune too.

YES... but no use of taking the secondary... main HP is coming from the primary... but if you take both out heck why not... just make sure you put a resonator...
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      12-09-2011, 12:11 PM   #8
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I'm leaving secondary cats and oem resonators.
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      12-09-2011, 12:58 PM   #9
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The cheapest full x-pipes have no resonators and are really loud. You have to be young to enjoy one. TopSpeed sells one for $500 on ebay. I bought one and it fits and seems well made, but I am adding four resonators. Resonators are pretty cheap -- about $50 each.

The problem with Turner test pipes is that they eliminate the primary cats that sit right before the rear 02 sensors so the car should not pass readiness inspection during the OBD2 plug in. It will probably still pass a sniffer test because the secondary cats are still there. You could probably add a set of 02 bungs after the secondary cats and extend the 02 wires.

Sosi sells a partial x-pipe that leaves the primary cats in place and eliminates the secondary cats and the stock resonators. The consensus seems to be that the primary cats are the biggest blockage to flow and that the maximum benefit from an x-pipe mod comes from removing them.

It is possible to substitute one pair of high flow cats for the four stock cats. Akra uses 100 cell units, but they won't pass a sniffer test. You need at least 200 cell units to do that and possibly 300 cell units -- I would like to see some data on 200 cell versus 300 cell. High flow metallic core cats range from about $100 each to about $500 each depending on which brand you buy.
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      12-09-2011, 01:26 PM   #10
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Come to think of it.....here is your best option! You will not find a better deal. I've seen, heard and driven this car. One of the most powerful blown M's in the country. This is a steal and I'm sure M33 would take an offer from you....

http://www.m3post.com/forums/showthread.php?t=617716
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      12-10-2011, 02:54 AM   #11
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so what i've gathered is for the best power with a xpipe you need to lose the primary cats... the problem with this is i won't pass an inspection and it throws a cel?
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