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There is no comparison...long tubes are much much better everywhere for everything...if you have to comply with emissions, run cats...shorties are a waste!
I always thought shorties made more low end power... Even though I tell everyone LTs or go home.
It's the opposite. Shorties make similar power up top as LTs (due to sheer flow) but down low is where they suffer compared to LTs (due to lack of scavenging).