i don`t know, a properly derestricted air box with a good panel, nice clean intake manifold and tb coupled with a decent straight through exhaust system should make some (at least a little one) difference to engine performance on pickup and longevity as you are allowing the engine to breathe properly... just my 10p though...
It didnt make any difference on mine, it makes it sound faster
When you are sat in traffic and get some nice heat soak, it makes it worse Hence mine is now in the wing, where the fog light used to be. But even with that it doesnt make a huge difference, does sound nice though.
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