HT4100 4.1, 4.5, 4.9 Discussion, 7mpg average! Help if anyone can. in Cadillac Engine Technical Discussion; would a flomaster highflow cat help? and should i replace the rest of the exhaust while im at it?...
Hmm doesn't sound too loud. You get alot of droning?
I heard Magnaflow isn't as bad from inside the cabin.
The droning is nothing compared to a glasspack but its there. IMO the sound with the Flowmaster and no cat is just too abrasive for everyday driving. It def had a great idle sound though. It drew alot of attention.