My original exhaust consisted of RB Road/Race, dual 2.25 pipe, 2 4-year-old (blown out) glasspacks, merged 2.5 and a 2.5 Thermal 16" long muffler at the rear. Now get this...today I replaced the blown glasspacks with 2 4-inch round 20" long magnaflow mufflers...AND THE EXHAUST NOTE GOT LOUDER....maybe not louder out the back, but now it is so deep and resonant that it sorta drones and bugs. I'm thinking my 2 year old rear muffler may also be blown...but damn, you'd think it would have gotten a lot quieter. Right around 2100 rpm and 4100 rpm it gets way loud....it does sound like my n/a second gen with a borla cat back though...wierd.

Any suggestions on rear mufflers? No RB suggestions please...it would be way too small for this application. How quiet are the large magnaflow mufflers? Will a new rear tame the drone? Rotoflo are too far and too expensive, a big *** HKS muffler from another application customed up to fit? I'm looking for something oval...unless round versions have more packing (?)

Anyone have similar problems?

 

Did you said 4 inch magnaflow mufflers? or was that a typo? If not, that's your answer right there, replace them with 3 inch mufflers (Borla), or better yet 2.5 inches.

 

^^ I believe he was talking about the canister diameter and not the ID.

 

Yup...magnaflow 4-inch round mufflers...2.25 piping size, 2.5 core.

 

sounds like u don't like rb systems, but from all the threads i've read about ppl complaining about all the different systems they've tried and how loud they are, anything outside rb won't be quiet enough.