Custom all the way, I won't buy a branded exhaust again.
mugen
Im running a b18c6 in my ek4 saloon daily, got a manifold, decat, 2.5 inch exhaust and oem dc2 backbox, the exhaust is super quiet and yesturday it made 204bhp and 141 lb ft, so id say its not restricting it, id go for manifold and decat and leave the oem ek9 exhaust alone.
id go for manifold and decat and leave the oem ek9 exhaust alone.