azaytsev

why would someone choose x-pipes over cat pipes or opposite ???

Saaboteur

If you look at the very first post in the thread, I linked to another thread with some discussion on the topic.

X-pipe is supposed to encourage exhaust scavenging, but word is you may lose some low end torque. A 'normal' cat pipe should avoid that. A totally catless straiaght pipe does lose low end, but substantial gains at the top end. There was a thread showing the dyno charts on that.

911PCarFun

based on links it seems as though the x-pipes include cats.... is that accurate?

Saaboteur

Yes indeed. My understanding is that catless pipes will cause a tangible low end torque loss.

lowbee

Did u ask Topgear if their pipes will trigger check engine lights ?
I have not seen a review say it does but better to ask the question now

howiedoit

When does this group buy start? I'm ready to buy!

Saaboteur

Some answers to more questions:

Shipping is confirmed to be with DHL.

996 and 997 headers will be available soon.

No issues for PSE fitment.

No CELs are triggered - complete de-cat or 100 cell cats may do so, but the 200 cell should be fine.

The group buy will 'go live' once stock on the cat pipes is confirmed.

lowbee

Very good. Thanks for doing all the leg work.

TonyTwoBags

996 X-pipe with cats

FYI to OP that there are 3 or 4 in the 996 thread that are interested but haven't posted here.

Kurzheck

As a new Porsche 997.1 C2 owner, some dumb questions.

Is a muffler change from my OEM suggested if I go cats?

Does anyone know if the 200 cat pipes would nullify a warranty?

Would these present a smog issue here in California?

If I read the OP right, the cats will NOT come with a low end torque loss, correct?



I would interested in the cats if someone can help me out with these questions. Thanks!

Prmike

+1 for the x pipe

Saaboteur

I'll try:

The cat pipes should give an tangible increase in sound, but probably not obnoxiously so. The mufflers will still 'contain' most of the sound due to the circuitous internal routing of exhaust. If you want even more volume, then it's up to your personal preference if you want mufflers too. Many people do the 'Gundo hack' (search it and you'll see) and that adds some volume to the OE mufflers, similar to Porsche Sport Exhaust (PSE) but obviously wouldn't be switchable.

Unfortunately, I don't have answers to your next two questions about warranty or smog testing. However, the cat pipes will still pass UK Ministry of Transportation (MOT) testing. I don't live in California (have only visited many times!) so can't comment more.

The X-pipes are supposed to gain more higher end at the expense of some low end torque. The regular cat pipes should not lose low end torque. However, I don't have figures or anything, this comment is based on my own reading of forum posts, and some discussion with various vendors.

BF951

I'm in for 997.1 cat pipes.

jason89i

Interested! 997.1s Cat pipes.

Lugnutty

I'm in for a cat pipe.