I have a full cat back on my car overtime I notice the sound gets weaker. I have a gmpp muffler at home will switching the muffler make a difference the gmpp had the same inlet as the catback but the gmpp has a bigger outlet. Or should I just get a catless downpipe

 

catless downpipe sounds like ass cake

 

I had GM homed exhaust manifold Lsj downpipe and magnaflow cat back on my 2.2. Sounded awesome

 

I know other members here have the GMPP and they said it sounds good. I have the Magnaflow and I can say that it sounds good also.