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Not you - the thread starter lol. I know you know your shit ;)

He (the thread starter) sounds like a disgruntled 1st year student - all book smart and no real world knowledge. No offence OP - but you sound like you are directly quoting wikis / other net...

3 inch is good for a k series , or turboed b series. 2.5 is gud for a b18 2 inch is gud for a b16 etc
The Internet knows this , what's the point of this thread ?

Have you driven a street car ( or...