Dump Pipes

[FelixTRX]

OK peoples,

I'm looking at getting a new dump pipe for my wife's S1 RS4, so I can make a new 2.5" exhaust for it, in the hope of better fuel economy(and a better exhaust note!) And I'm going with 2.5" because it's stock boost, have some 2.5" mufflers handy, and I have plenty of it floating around in my garage

I've tried to follow bits of other threads that have wandered on and around what I'm trying to find, but can't really make much sense of it. Seeing as I'm so stupid, can people list where they have sourced their dump pipes from and how much (roughly) they were, and if you had any issues with them.

Thanks in advance, Greg.

P.S. It's raining so I'm not going out to look now but do the Stag's have any kind of sensor's in the cats that the ECU requires, or can I remove it altogether (or perform taxidermy on the cat instead?).

[MRO]

i bought the just jap dump and front pipe - same as a r33. It is good quality stainless and cost about $250 i think

[jippa]

got my dump pipe of ebay, am performance i think, 280 cost but its for a s2 so minor grinding to make it seal to turbo properly. also got a metal cat and it had no sensor attacment so the shop just tuked it up next to a heat cover and no troubles

[GoldZilla]

i bought the just jap dump and front pipe - same as a r33. It is good quality stainless and cost about $250 i think

Just Jap have a few different ones available - I bought one of their own JJR ones (to suit an R33) and it wouldn't fit my s1, maybe because mine has been converted to manual and the pipe would have rubbed/hit on the body where there looks to be another point to mount the gearbox. The R34 X-Force one they sell looks to be a better fit, as it has a kink in it which looks roughly where the mount is on my car. I returned the other one, and haven't yet bought the R34 X-Force one to fit up.

Here's the JJR one for the R33:

Here's the X-Force one for the R34 (see how it kinks near the end?):

If/when i do upgrade my standard one, I might take it off the car and take it down there so I KNOW that the R34 X-Force one is a closer fit than than the JJR one I returned...

Oh, and the guys at Unique Autosports told me that they're getting better results (both response and power) with the non-turbulence X-Force style than the JJR split style ones.

[FelixTRX]

I have seen a short dump pipe for a R33 GTSt at a local speed shop down here in Hobart for about the $150 mark, and that has a splitter built into it.

Personally, for me, a short one is better because it gives me more freedom with my design of the exhaust (I'm a welder who fabricates exhausts from scratch for fun!), so I shouldn't have the firewall clearence issues you guys seem to be having.

I'll try and get some pics of the dump pipe I'm looking at.

And the one I'm looking at is polished. How can I make it black so it don't stand out? I was thinking just a light sanding and some VHT heat proof paint.

Feel free to keep the suggestions coming!

Cheers, Greg.