I recently made a full exhaust/cat delete for my car.It sounds really good,butt dyno agrees with changes.Everything is fine except im getting a faint "putter" sound at take off.You cant even hear it in the daytime but at night like in my neighborhood I can hear it.I was reading up on exhaust scavenging and other things trying to figure something out.

Its 2.5 inch,normal for this NA car,all the way thru with mufflers on the lower section.I have -not- welded in 02 bungs in yet. I'm thinking of adding some smaller vertical cross tubes to see if it affects it.



Suggestions ,ideas anyone?