I have a catless downpipe and stock exhaust. Is there an exhaust that will reduce the noise while maintaining or improving performance?

 

From experience I have found out that different size mufflers make little difference in sound. A different type of muffler may help. I've always used Magnaflow because they use a straight through design. Flowmaster mufflers may be quieter because they have baffles.
A high flow cat I would think would make the exhaust quieter.
I think resonators make exhaust a little quieter too but I'm not positive about this.

 

I had a ZZP catted DP on with the stock catback and it was much quieter than the catless DP but louder than stock. Trouble was 1850*f+ EGT's on long hard pulls (tuned) wasn't good for cat life.

 

Get the longest resonator you can, it will quiet it down and reduce rasp.

 

quiet* and yes, get the longest resonator you can. It'll help

 

So what will be the difference in choosing between a resonater or quieter muffler in terms of performance. Also how would I know if a muffler will make it louder or quieter.

 

Get the hahn catback... as quiet as you can buy