Hello guys i am having a problem with getting the correct muffler.When i got my assembled wrangler it had a surplus muffler it was a silencer type well that one rusted out so i got another one put in at a local muffler shop it was half the length of the original one and its diameter was a little smaller the original one was actually preatty big but what i notice when they put the new one in there was a great decrease in power it felt like the engine was chocking.So i ended up putting in a straight through exhaust great power output great response but damn noisy..I was thinking about getting an elf type muffler which is a straight pipe with only one division...any suggestions?does larger exhaust diameter increase power?