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hi guys.... i got a 03 civic gli here in Australia... just wonder wat would be best muffler to put in... i have these muffler has a 2 1/2" inlet and a 4 1/2" out let..... or i have a 3" in and a 3 1/2" out with silencer???? i think the 2nd is not good 4 my car is it coz of the 3" inlet????wat u think???? thanks

 
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The shop could do it for you eventho it is a 3" inlet...so it's actually how big you want the outlet.

 
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3" inlet? our cars are not V8s.

Go with the 2 1/2" inlet one.

What brand are your mufflers?

 
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i think it just one of those no brand ones...

 
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2 1/2 all the way back into a nice stainless one..

umm but you dont know what brands?!?

 
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made in china lolz..... just muffler at the monment coz low on cash...

 
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Don't do custom piping...just weld the muffler.

I'm pretty sure that the muffler you have will sound like crap with custom piping and no resonator.