i do believe that you can hear the engine regardless of whether or not you've an aftermarket exhaust. Syko's Four is bone stock except for an air filter and a GT32 turbo. i can hear his engine (not turbo) just fine...
oh and also, wasn't there a mongoose exh. for our cars?
yeah, there's mongoose, blue flame and maybe a couple others...all from the UK. Pretty much no one in the US has imported any because shipping usually ends up close to the actual price of the exhaust. :doh: