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you not wasted money mate lol. it will make a difference , just not as much (its only a marginal one anyway). i have a 2.5" bore straight through system with a silenced decat on and it is loud so if thats not waht your after then you have made the right choice lol. heres mine http://www.cliosport.net/forum/showthread.php?442769-kevs-172/page4
Ive got a 2.5 system on my 182 with a silenced decat and silenced centre section, n it sounds good, loud but not 2 loud!
Wouldnt make the standard system much louder but on an aftermarket one it will!