Hey guys, Just wondering how much performance would be gained from duel exhaust cat back vs single axle back given the same brand names??
The general word around here is that performance will get worse for a naturally aspirated V6 if you go to a dual exhaust, especially in the low end range. Basically the engine doesn't push enough air to take advantage of the increased volume and it ends up hurting performance. I google'd 'exhaust scavenging volume' and found the following link http://www.bigcitythunder.com/pages/understanding_exhaust.pdf. It looks (I only briefly scanned it) like a pretty good read for some better understanding of what your exhaust can do for you. Hope that helps
i dont think its worse. maybe like 1-2 hp. you also have to consider if your gonna get an x pipe h pipe or y pipe. headers will help flow more also.
Key points from this article: Also: As for scavenging, MOST companies offer "X" pipes for the V6. Including Ford Racing. These pipes have been designed by engineers, who know how to design for best performance, so I will give them the nod as to which way to go. My pony has an "X". Dual exhaust, T-LOK, brand new tires, and NO TUNE yet: http://media.putfile.com/SOHCman-Pypes-Acceleration SOHC PS: Can't wait for my tuner...
What would be cheaper about a shop custom-bending pipes? Why would you want an uneven, fit-by-eye set of pipes? Those days are long gone... Half the shops people talk about on the boards won't even put duals on a V6, even from a kit, WTF? I had a shop give me a "I don't know how long it will take" estimate... "Maybe 2 hours maybe 4." This was the Pypes kit that goes together with CLAMPS. No cutting pipe stock, no bending pipes to fit over axles, no welding... That does not instill ANY confidence in these shops anymore. My Ford dealer does my work no questions asked... "Ya about 2 hours"... Done. SOHC
Duals don't hurt me at all. Although I would say keep the single unless you like the looks. I have Mac long tubes, off road pipes, Mac prochamber and moroso spiral flow mufflers, I run 14.10's, so they are helping. I started with JBA true duals, then added MAC shorties, then took the cats off, then the current system. The true duals sounded fine and I liked the looks, but they weigh more because there are now two mufflers and pipes. No power loss on my part with a big exhaust, but I have probally pushed my car harder then most.
Thanks for the help guys, I will probably go with a dual exhaust and x-pipe from basanni after listening to all the clips out there. That article was pretty helpful and if I am going for performance in the long term, i.e. supercharger/turbo then it would seem wise to spend a few more bucks for the most open exhasut possible.
