My RZR: 2019 Indy Red Turbo S
Join Date: Dec 2007
Feedback Score: 1 reviews
Re: Aftermarket Exhaust
Here is another opinion. It is just my opinion. This, obviously would only apply to racing vehicles, since tampering with emissions related parts is a violation of federal law, and I know only those of us who are racing in sanctioned events would even consider that.
The biggest advantage to be be gained by removing the stock muffler is to remove the cat.
The cat creates much higher exhaust gas temps, which is bad for your turbo and everything upstream from it. Many of these aftermarket mufflers are a joke, offshore cheapo mufflers with a cool tip put on them and sold for a whole lot more than they are worth. If you want to keep the sound down, and are not worried about doing permanent mods to the stock muffler, unbolt it, cut off the inlet side pipe at the muffler, and remove the cat, then reweld the pipe and bolt it back on. (For racing only, ya know)
Only major engine builds are going to benefit from a header back system, a bolt on muffler after the collector is going to fine for 95% of us.
Don't expect a huge seat of the pants boost in power, but your engine and turbo will thank you.
If you decide to buy an aftermarket muffler buy a good one.