hi I have an Opel Astra G with a single exit exhaust .
Can I change it to a duel exit exhaust??
will it affect my engines performance?
If I do this do I use a centre dual out muffler ?????
Hi I'm a beginner to tuning cars and I was thinking to start at changing my muffler . Which kind of muffler can I get for my opel astra g for a loud sporty sound???