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Hi there aftermarket headers are required if you are go up to 400BHP,if you have lower than 400bhp i will recommend OEM ported headers.
Which i know GT Spec are probably best for money......
I'm looking for about 400 give or take, just wondered what the quality was like as ive seen some for for sale
GT spec are proven headers,i heard so many problems with Japspeed headers(or no name headers),due this i will recommend GT Spec,but decision is your matey.