Superformance Exhaust

[maxum_101]

not sure if this is your style of head...

http://www.fireflyperformance.com/header/index.htm

[wanab5150]

Terry Lee.....what brand of headers are you using? tom

Maxum 101.....I think I'm screwed on the headers. I think the ones on my car are for a stock 351 head (small port) If that's true There's still a ton of restricted HP to find.
Superformance may use the 2" I.D. muffler because the crappy headers clog everything up anyway, so what's the use. Superformance does not offer an option. I'm still checking. tom

[Jim Norris]

Originally Posted by wanab5150

Terry Lee.....what brand of headers are you using? tom

Maxum 101.....I think I'm screwed on the headers. I think the ones on my car are for a stock 351 head (small port) If that's true There's still a ton of restricted HP to find.
Superformance may use the 2" I.D. muffler because the crappy headers clog everything up anyway, so what's the use. Superformance does not offer an option. I'm still checking. tom

Tom,
I don't know which headers you have, but Superformance at one time offered headers with less restrictive openings. They were called the "402" headers. Ask Stephen about their availability.

[Got the Bug]

Originally Posted by Jim Norris

Tom,
I don't know which headers you have, but Superformance at one time offered headers with less restrictive openings. They were called the "402" headers. Ask Stephen about their availability.

I'm not 100% certain, but I believe that later model SPFs come with the 402 header as standard equipment. My car (2613) which was shipped just over two years ago came with the 402 headers. Based on the info that I had at the time, my car was kind of on the cusp of the change.

I'll probably be seen as a heretic, but I'm going to go with quieter side pipes when I re-do mine. Even if that means giving up some HP.

[wanab5150]

See below...I screwed this reply up.

[wanab5150]

I certainly understand the quieter pipes and if I had not heard the 3 inch mufflers and found out how much HP is lost because of, in my opinion poor set up, then I would have been happy. Fortunately or unfortunately, I did find out!

I went the extra mile for the Roush 427R and assumed the superformance dealer would provide a correct set up for the engine they recommended to me.

I paid extra for a bunch of options such as the 17" wheels, non standard color choice, seat modification, and more. I would have sprung for a correct complete exhaust system if I had an inkling it didn't match up to the Roush motor.

If I only wanted 400 HP, I would have just put the Roush 347 inch motor in it and saved a bunch of money. Even the 347 makes 450 HP.

As far as the headers go, the heads on a 402 have smaller intake runners and intake valves. I can't imagine the exhaust port would be the same on both heads....what would be the use? larger intake runners and valves require larger exhaust ports and headers unless you want all torque and no top end HP.

If what you say is true, I still need a larger header. I would feel a little better if I knew I had a header more set up for my engine like yours. I might even pass on larger headers if the size difference in relatively small. Still investigating!

[thudmaster]

Tom, the 402 headers are much larger than the standard superformance headers. They match your roush heads.

[wanab5150]

Ed I hope so. I will ask Steve in Reno tomorrow.thanks