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I have been playing with my stock intake I did a similar thing as this guy but I used a lpg torch to remould it to about double the stock size pretty easy to do but didn’t really pick any thing up where I did pick up hp was porting the throttle body side of the intake where it fits on to the TB rubber stock mine was only 36mm so I ported to 45mm as TB was 42mm definitely picked up mid and top end but I needed to run a richer map as after porting ran quite lean right across the rev range I am waiting for new stage 2 cams atm which could be more interesting
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