Apexi N1 vs. Greddy Evo

Does anybody have a prelude with either which one is louder and do you lose sound by getting the turbo application when you dont have a turbo yet. I no some amount of back pressure is reqired but im not sure.

I believe the N1 is louder. Who can tell with all the knock-offs these days, but every N1 looking can I have seen has been louder than my car.

BTW: An Evo wont fit a non-VTEC lude without modification of the flange that goes to the cat. Might help your decision.

Thanks alot I was leaning toward the N1 anyway. But I have a vtec though.