Im looking to buy a Magnaflow muffler for my 89 Civic Si, but there are many universal mufflers that they sell.

To the guys who have this muffler, i was wonder what the correct size is. how do you like the magnaflow? is it the best flowing Oval muffler out there?
This is pretty cheap, but is 4 x 9 the right size? http://cgi.ebay.com/ebaymotors...94187

 

if you want it to sit like the sideways styled ones, it should fit.
my idea is get one or two of their round 4" ones and put them up near the mid section of the piping, and just have a normal 2.5 pipe exit on the right side....
super sleeper style if it fits, i haven't measured yet.

 

yeah, im looking for it to be as stock looking as possible, with the maximum flow.
Im also look at the ES mufflers.

Has anybody bought theirs from Ebay? that one in the link is only $50.

 

the Bomz Evolution N1 Spec is pretty good thats what i have on my hatch

 

anybody ever tried one of those megan n1 mufflers off ebay that are apexi copies?