Contour Enthusiasts Group Archives Forums Modifications Duratec Performance Three inch exhaust = much more power

My last post didn't really convey the message I was trying to put out. Bassani exhaust and all these other systems are nice and very expensive, but I'm just trying to say they still don't allow the duratec to exhale enough. The power gains I got were a slap across the face. Once the computer calibrated that there was no longer a sock in it's mouth, and now three inch pipe to put out all that exhaust, the power is amazing. I'm sure were talking about 11 to 14 hp gains. The engine doesn't put out power through winding up or after 3200 - 3400 rpms, it's now very consistent. If you're about 16 or 19 years of age (I'm 18), go to highschool and could care less what others think, this may be the cheap mod for you. I only paid $170, not $1000, and my car now sounds like a Subaru rally car or a 5.0 running straight pipes. Best of all, NO RASSSNNNHHHSP. This system requires no mufflers, just the stock tips and a flowmaster Y-pipe. I will post pictures later and try to get a Dyno as soon as possible. I don't have a chip, just a K&N filter. K&N filters are bad by the way. They release fibers that get caught in the MAF and burn it out.

Well not to be to blunt but none of what you says makes sensce. But show me a pre/post dyno and I will believe..

K&N fibers???? Too much oil may go to the MAF if you overoil.

If a K/N is so bad, why do you use one?

Also, a 5.0 with straight pipes and a subaru rally car have two very different sounds, or do you mean the sounds combined?

Hopefully your combo does work well, It just sounds like there are too many diameter changes to be an effective exhaust.
Getting a Dyno plot would be very good.

Good luck

Let me clarify something. You say you have 3" pipe all the way back with no mufflers, no 3rd cat and stock tips and absolutely no rasp?

I find this very hard to believe. With my Bassani and Off-road SHO y-pipe I had enough rasp to choke a Horse! It was absolutely unbearable! Now even with a resonator in place, I am still considering a larger resonator! I am 23 and enjoy a loud exhaust, but even I have to draw a line somewhere!

Well, if you want me to get technical then I will. The three inch exhaust starts at the what I believe is the last cat since someone mentioned there were three which is right behinf the tranny. However, I believe one of the three cats you thought was a cat is actually a collector. But listen here, you can't have a total of six inches of exhaust (considering the dual exhaust)as you do need some back pressure or you will blow seals and what not. So, the three inches becomes 2.5 inches after the flowmaster y-pipe which is located right before the independent suspension for a total of 5 inches of exhaust clearance for fumes. The sound is much more that of a rally car. I swear to God...no rasp. By definition rasp is an awful sound like that of someone in your back seat blowing through a trumpet all day and rattling a can of marbles. This systems' sound is identical to that of some top rally cars. If you were to get headers ... oh my! The stock exhaust manifolds are as ugly as they get.

Please explain the 'no back pressure will blow seals and what not'....this is a new one on me?

He probably means the seals on his wallet

TB

Hey man, I'm a repeating-Tom. This is what I was told at the exhaust shop. I'm sorry I don't really know anyone who has knowledge like many on this website, but I'm only tellin' what I heard. Since you seem to think I don't know what I'm talking about then tell me what would happen? Also, fill me in, since I think you own a differential company, what a PCM would do for our engines. Is there something out there that allows for someone to change the air fuel mixture besides a chip?

Alot of people (TOM) will say a lot of things when they know they can get your buying dollar.

just my 2 cents

Hmmm... I guess I may be wrong, but it sounds like someone needs to put the pipe down and walk away...