My Ser 1 SC has the two muffler arrangement. I replaced the rear muffler and tail pipe when I first got the car. Now I've rebuild the engine it still sounds very 'tinny' when accelerating. No manifold leaks or loose damaged heat sheild. I'm confident its the front half of the exhaust system. Wondering if this is common. Can I improve it by replacing the front muffler with a resinator.