ROG100

A Y pipe with the 928 International cat back exhaust - way awesome.

Fabio421

I have the MSDS headers into a Y pipe on my 78 widebody. I am very happy with them and it feels strong but unfortunately I dodn't have a dyno to back it up. Sorry.

Rob Roy

What kind of performance gain could be expected with these kind of exhuast mods (headers & Y) on a 300 hp Euro (81)?

Rick Carter

If it gave me 10% more power I would be surprised and ecstatic.

stealth

I should note that my 10% is probably being generous to the headers...the entire exhaust setup I have was about 10% on the 5.4L (no intake mods or forced induction)...MSDS -> 3.5" Y-pipe -> Random Tech cat -> 3.5" -> Borla XR-1.

Shop also found a couple of cracks in the headers recently near the collectors, patched them with welds.

hacker-pschorr

What exhaust manifolds does your car have?

IIRC Jean-Louis Euro track car was stock except for headers, put down 270ish rwhp.

Since your car is boosted you really should measure the backpressure in the exhaust. If you have more then 1psi, a free flowing exhaust will free up power.

Rick Carter

I've never measured exhaust back pressure 1psi seems very low. How much does it vary over RPM, boost and load range? My exhaust is designed to scavenge with the Tom Cloutier Y merge collector, similar to Burns Stainless.

soontobered84

No dyno to back me up either, but my seat of the pants tells me that my Euro with the headers breathes and runs a LOT better than the Euro that does not have the headers. YMMV

hacker-pschorr

Per the WSM anything over 1psi is not ideal, so no it's not low

Rick Carter

Are you measuring at the O2 bung; what tool are you using to measure? Do meaure pre and post cat? I don't have a cat only a small dog.

Louie928

I have a friend who had a GT with X pipe and 2.5" rear exhaust. It made about 320 rwhp max which is about normal. He wanted headers. He got a nice set of equal length headers and had them ceramic coated. I made a tapered transition to go from the 3" header collector to 2.5" X pipe and connected to the existing 2.5" rear exhaust. I'd say it would be about the closest comparison you could make between what you could do with the stock manifolds and again with headers. The best I could do with that setup was 316 rwhp. Sharktuned and all. The tests were done within a few days and no other changes were made. Maybe a different X pipe location would help some. Maybe something else would help. Once you have a good X pipe and rear exhaust, that's about all you can do. This on a GT and I have no experience with 16 v US or Euro so I can't say what the difference would be for those.

I have a set of MSDS headers for a 928. They are new, ceramic coated, and polished to look like chrome. $400 plus shipping.

123quattro

Someone needs to buy these. That's a deal!

Rick Carter

[QUOTE=Louie928;5751762]I have a friend who had a GT with X pipe and 2.5" rear exhaust. It made about 320 rwhp max which is about normal. He wanted headers. He got a nice set of equal length headers and had them ceramic coated. I made a tapered transition to go from the 3" header collector to 2.5" X pipe and connected to the existing 2.5" rear exhaust. I'd say it would be about the closest comparison you could make between what you could do with the stock manifolds and again with headers. The best I could do with that setup was 316 rwhp. Sharktuned and all. The tests were done within a few days and no other changes were made. Maybe a different X pipe location would help some. Maybe something else would help. Once you have a good X pipe and rear exhaust, that's about all you can do. This on a GT and I have no experience with 16 v US or Euro so I can't say what the difference would be for those.

I have a set of MSDS headers for a 928. They are new, ceramic coated, and polished to look like chrome. $400 plus shipping.[/QUOTE]

I'll be glad to buy them if I'm guaranteed not 10% just 10 more rwhp.

Louie928

With your SC, you *might* get 10 rwhp. Pretty much depends on what you have for exhaust now.

Rick Carter

I have the Cloutier now, although it is only a single 3". If I could get Tom to make one in 3 1/2" or 4" it make give me more high rpm power.