ok guys how well does the 2.1 respond to simple bolt on mods like free flow exhaust, k+n filter and high lift rockers, or more to the point is it worth spending a little extra when these things need changing or is it best to replace with std parts.
i`ve recently had the exhaust off and noticed there is a big resistance to flow 1/2 way down the silencer. looks naf to me.
lee.
2.1 tuning
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