John,
I just put an SPM on a guys car here...It only has a single resonator/muffler...Didn't drive it under load so don't know. Mine was an APR system. It had no drone to start. The resonator was to quiet down the Downpipe. It did smooth it out a bit. An additional resonator "should" help but no experience so I can't be sure..
I just put an SPM on a guys car here...It only has a single resonator/muffler...Didn't drive it under load so don't know. Mine was an APR system. It had no drone to start. The resonator was to quiet down the Downpipe. It did smooth it out a bit. An additional resonator "should" help but no experience so I can't be sure..