I didn't do a before & after dyno test, but I did do a b&a test at the track.
Using stock plenum with a SVO 70mm tb.= 11.74@116.2
Same day, at the track, I switched to the CnL plenum and kept my 70mm tb.=11.74@117.9
So basically, my car gained almost 2mph. I'd say 15 rwhp is a realalistic figure.
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