Quote Originally Posted by EUR003act View Post
you'll get approx 10kw gain atw with TODA headers using STOCK exhaust!

euros catback is already pretty damn good for a stock system... not much power to be gained there... extractors and cat will be where you find all your gains
I've tried and dyno tested quite a few exhaust combinations between headers and cat back systems (single and dual)... The stock catback is actually quite restrictive, especially on the mufflers. the mid section is good for up to around 120kws odd. There are negligible gains on upgrading the cat con even if it to a metal cat.