cat to muffler pipes

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hi im new here.

i just wanna ask what is the best size for the pipes between the cat and the muffler.

2.0" or 2.5"?

[Civic Accord Honda]

2.25

[Bass Man]

2" if you plan on staying in CA, which means you can't get any power out of it, which means 2" would even be too big, but it should do fine.

Edit: You won't gain any performance bigger than 2" unless you put a lot of money in the motor first.

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damn! cuz the muffler that i wanna get has a 2.5" inlet and i cant decide if i should get that...

[Pico]

2.25 nothing bigger IMO.

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thanx man!

[turabaka]

yep. 2.25 is the right size. It's what I use and I lost a bit of bottom end power before I put the bigger carb on it. So definitely don't go bigger than that.

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thanx guys!

[MessyHonda]

replace the cat too with a 2.25 inch one...on my set up i think its a bit loud....put in a resignator if you want to quiet down and keep the cops from looking at you funny

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replace the cat too with a 2.25 inch one...on my set up i think its a bit loud....put in a resignator if you want to quiet down and keep the cops from looking at you funny

fosho bro. i'll keep that in mind. thanx

[Demon1024]

2.25 mandrel or crushed?
been thinking about putting something together before i get the head....
Why not bigger?
Hate to thread jack but it seems relevant

[Bass Man]

In the shortest explaination possible, colder exhaust is harder to push than hotter exhaust. When you go from 1 5/8" to 2 1/2", there is a whole lot more room for that exhaust to cool down, which slows it down increadibly. A good exhaust system will be almost as hot at the tip as the header.