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he talks about "70' custom exhaust sustem " by which i think he means 70mm which is about 2.75 inch, but the runners he uses on his exhaust manifold look suspiciously alot like my 48.5mm ones...so say about 52mm outside diameter
just remember, our engines flow gas like a bat outta hell, so yeah bigger runners would help, just so long as you put some sort of back pressure on the exhaust.
WFX: i suggest you do what he did, just as i have, get the 1.3 bar TRD radiator cap, it really does do some magic
im currently making myself a oil catch-can and placing it just where he has it lol
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