I would try the test pipe first like you mentioned, that is also more easier to reverse if you dont like it.

 

when i removed the rear muffler on my gst it didnt make that muchof a difference, but once the cat was removed it sure as hell soundeda lot louder, but then again my car has a turbo.
and in a way i think i agree with sebba
if you remove the cat and the resonators it will sound like a bag of ****.
i think removing the cat will make it plenty loud.
and also remeber...
the louder the easier you are to spot when your ****ing around !!!
and it will be like driving around with a huge pull me over sign on the back of your car.

 

thanks i have one problem though i need the falanges for the ends of the test pipe i cant find them online so im thinkin of goin to a junk yard or orderin a cheap cataylic converter and cuttin the ends off of it..like the clamps to bolt it to the other piping...if anyone knows where to buy those let me kno thanks...

 

Try a local muffler shop, thats where i got mine from for my test pipe.

 

hey thanks for that yea ill try to go to the muffler shop and see if they have some which they probably will...i have another question would a test pipe made for another car like a 2g eclipse fit on a 3g eclipse or not? like is it the same length b.c if it is then it should fit...im goin to measure my friends test pipe tonight and see how long it is then measure my cat.. converter and if its the same i might try his test pipe on my car but if not then ill just go to the muffler shop and buy some flanges and gaskets....iight