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      03-19-2009, 02:14 PM   #31
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J08M3's Avatar

Drives: 2011 M3 COUPE
Join Date: May 2008
Location: NEW YORK

iTrader: (8)

Originally Posted by bim14 View Post
I don't know too much about the technical stuff with the exhaust of my car. But if I want to make it louder, I would just have to ask a local shop to take out my resonators? and/or secondary cats. What do you guys suggest is the best/safest setup for me to go with. I would change the whole exhaust but it costs too much, and i like the way the stock mufflers/tips look with the car.
Yep, that should make it a bit louder. Probably not much though.

The reason I'm looking to leave my resonators and only delete cats it I want a more aggressive sound that's slightly louder under hard acceleration, but I don't want it to sound to raspy or to drone while cruising around. If you look at the $1,900+ x-pipe AA came out with it's no different than your stock x-pipe with resonators minus the secondary cat. I'm looking to accomplish the same thing for a very small fraction of the price. Plus according to a number of tuners there is almost no gain by switching OEM primary cat to aftermarket High Flow Cat (costing $1.300) By retaining stock primary cat I won't need to re-flash my ECU (another $1,000) Also, I've yet to get any answers regarding what the HFC's are made out of (ceramic or metallic), I've never gotten a CFM comparison between OEM cat or HFC (only way to prove it flows more). I don't want some cheaply made HFC (probably from china) giving me issues in a couple of years. Exhaust shop eliminating secondary cats should only cost a couple hundred dollars at most.