Not gonna pound out the elbow as it's cast iron.
There are only 3 reasons not to run cats (really 2):
-You run leaded race gas.
-You're a cheap ass.
-You don't have emission testing where you live (but still, you're cheap).
A properly functioning high flow cat doesn't restrict flow or...
Stock catback is terrible, though I did see gains with the DDP only, the rest of the exhaust made the biggest difference.
Back pressure doesn't exist, it's flow, velocity, and the scavenging effect. Smaller exhaust raises velocity increasing cylinder scavenging which pulls out the exhaust...
That's why you run straight cut gears ;) Helical cut gears induce side loads on the case usually breaking it (this goes for all trannies, hence the thrust bearing issues in the R154).
That said, not bashing on the cars, just the mindset that they're "awsome yo". I still want an Integra...
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