Apex WS
Apex N1

and are these fairly quiet, not looking for a loud exhaust.

 

i thot that the n1 performed well with everything but was hella loud, and u sacrfice some top end perf. for a quieter sound on the WS, i had the n1 personally and two twelves bumpin trance drown out any sound i might be able to hear

 

simple... look at the design... ws = chambered, n1 = straight thru. The n1 will perform better. Whether the few extra hp is worth the noise is up to you.

http://www.tprmag.com/issue/3/3_exhausts.shtml

 

i rember sport compacts car's project eg the stock exhaust vs the apexi ws they gained around 10whp i think but thats a swap using the stock civic exhaust and comparing it to the apexi ws

 

n1 for sure...its louder than the WS but less restrictive