The cats on this vehicle already choke off the exhaust and increase the backpressure. Adding larger/louder mufflers on this V6 will only give you an unpleasant drone. You can experiment, but it's an expensive way to go. The entire muffler system is harmonically tuned in this vehicle, to NOT match up with any other mechanical frequencies in the car, essentially cancelling out any vibrations you may get from other areas, such as transmission, suspension etc. If you change the harmonics, you may wind up with secondary vibrations in the car, because you "detuned" the exhaust setup. Additionally, the backpressure of a dual out of one pipe in this car is not much, and has also been optimized for sound vs backpressure. Not much sound coming out my CX-9, if any at all - but I don't dare touch it. Been there with a V6, done that, and it's not pretty. V6's have a different firing order than V8's and they are much more difficult to tune in pleasing exhuast frequencies. Resist the urge to put Flowmasters on, you will regret it! Beside, you are probably too old to be doing that stuff anymore...! (mj)
Well, rogerspw, I think you and are are just too old.
Too old to crap up our cars like 16 year olds.
What makes you say it already has high flow mufflers?
The cats on this vehicle already choke off the exhaust and increase the backpressure. Adding larger/louder mufflers on this V6 will only give you an unpleasant drone. You can experiment, but it's an expensive way to go. The entire muffler system is harmonically tuned in this vehicle, to NOT match up with any other mechanical frequencies in the car, essentially cancelling out any vibrations you may get from other areas, such as transmission, suspension etc. If you change the harmonics, you may wind up with secondary vibrations in the car, because you "detuned" the exhaust setup. Additionally, the backpressure of a dual out of one pipe in this car is not much, and has also been optimized for sound vs backpressure. Not much sound coming out my CX-9, if any at all - but I don't dare touch it. Been there with a V6, done that, and it's not pretty. V6's have a different firing order than V8's and they are much more difficult to tune in pleasing exhuast frequencies. Resist the urge to put Flowmasters on, you will regret it! Beside, you are probably too old to be doing that stuff anymore...! (mj)
Good response. Too many guys think they can just bolt on better performance, but those days are long gone. The computer can only adjust so much to varying conditions. They can't just see a new intake or exhaust and re-tune the engine to perform better with them. This is exactly why most cars with those annoying mufflers blow smoke every time the driver hits the gas, and are as slow, or slower, that the factory setup. The computer is precisely tuned to the factory system. The CX9 is too mature to sound like a crotch rocket, anyway. It's an ADULT vehicle guys.
A high flow cat may be a good option to look into for better flow and possibly a bit throatier note.