Originally Posted by salmanman
Why would dual exhaust be a waste of money??
More breathing less restriction..... etc.
Are you talking about having a seperate pipe for the front exhaust manifold and another seperate one for the rear exhaust manifold? Basically true dual exhaust, or from the cat split it into two pipes. Either way its a bad idea. You can do a 2.5" (for N/A) or a 3" (*/C) and use a muffler that will split it forn a single into a dual if you have an SSE/SSEi which has the cutouts in the rear valence for tips. If you dont have the cutouts, I suggest a single pipe and single in/out muffler.
But I need to ask a few more questions to help you. What model of Bonneville to you have? What are your other plans for power? Are you all about performance or sound as well?
I run a 3" catback right now but I have other custom modifications on my car that makes up for the low end torque and I am doing certain and enough modifications to justify that. I use a magnaflow muffler. I am currently designing a catback system for Bonneville'* but demand seems low, I am still deciding on whether or not to produce it.