i have a 850 t5 manual, at the minute it has 16t running at 16 psi stock down pipe de cat 2.5 inch stainless exhaust and a re map.. i am thinking of getting bigger turbo 19t upgraded down pipe injectors manifold and the new map for it but i am just wondering will it make a noticeable difference to performance. say if i get it to 300 bhp i think it should be around 260 at the minute
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