on my civic coupe the Apexi N1 2 1/2" catback system sounds very nice and has a very deep sporty note.... and not a loud farty one! I rate it (APEXi)...as they have been in the car tuning business for ages... but it depends on what car you would be putting it on and also what the purpose is too...if its just for sound and looks... the N1 does both but if it is for performance, the N1 is great for small power gains in the mid-high range RPM... Hope this helps =)
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