Currently im in the VA/DC/MD area. Certain parts really frown upon aftermarket exhaust systems. I had a custom exhaust system that consisted of a DC 4-1 header, removed cat, 2 1/4 midpipe into a R1 Muffler ( straight thru ). All I can say is that it was really loud....well after so many tickets I decided enough was enough but being a college student I don't have money to completely change my system back to stock. It ran me 200$ just to put a stock axle back, back on.

Now my muffler a high pitch metal scrapping type noise at certain high RPM's. My theory was that it's too much compression and some noise is leaking thru the muffler turning into a high pitch sound.

How to fix this problem, if that indeed is the problem.
I was thinking about putting a cut-out (race-ready) right before the axle back, that way the exhaust looks stock but I dump out everything like it was a performance muffler. The best muffler is no muffler right? With the cut out I can easily cap it up when i don't want noise and when I do.

Oh yea, I know your thinking, "why not a silencer on my other muffler?" It didn't quiet it down at all...

All opinions and suggestions appreciated. Please note that I'm trying to rig this up ASAP and I dont have much $$$ to splurge.