I have a friend running a K04 on his GTI who is considering switching back to the OEM catback to free up a few bucks. I think its a horrible idea because in order to support those power levels, you want to have a nice open exhaust system and i'm also afraid of the effect that higher EGT's will have on his turbo... His argument is that catbacks are only worth about 5whp so it shouldn't have a big impact on overall performance
What are your thoughts on this?
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