ok, I just installed my rrm headers last week, they sound kick *** but...I want LOUDER! Now i know the first thing everyone is gonna say is to take off the 2nd cat and just run straight pipe. But seriously which is better sound wise 2.25" or 2.5"? Will I be losing any power going with the bigger??

 

just make sure you dont have a resinator on your exhaust, and youll be losing hearing in no time! Many people who have the greedy with the 2.5 say there is no low end loss, i have the magnaflow with the 2.25 i dont feel any low end loss. Well anything is louder than stock so go nuts. I would also recomend the rrm short ram. That baby sounds sweet and you can hear it in the car very very great sound!

 

I have RRM header, stock downpipe, 2.5" test pipe and 2.5" catback exhaust. that thing is damn loud.

People will say that you should go 2.25" unless you are going turbo as 2.5" will give ya no gains. I personally think that 2.5" is the way to go. Buschur racing developed and released their only OZ/ES/LS exhaust in a 2.5", which is designed for a NON-turbo (naturally aspirated) motor. It sounds fantastic. Deep sound, not whiney and farty.

If you want it LOUD, go with a downpipe, test pipe and catback exhaust. Its really up to you on 2.25" versus 2.5", but I'm going 2.5"!!!

edit: I had no power loss with just test pipe and catback. With the headers installed, I lost a tad on the low-end but it is worth it. Downpipe and PB ECU will address that for me I believe.

 

Ive already got the rrm short ram air, a flowmaster muffler, and ive already had the resonator removed. Just wondering about what piping I should go with. Ill probably go with greddy or magnaflow

 

Buschur racing dude, bushcur!!

bushcur, scroll down

2.5" will be loud!

 

2.25", cat, stock header, and I set off car alarms.

 

Greddy is 2.25". Thats what Rob told me.

 

Never really checked mines before installing

 

the magnaflow piping has a resinator not sure about greddy or bushcur

 

apex1 loudest exhaust you will ever find i ran that with a 2.5 cat back on the kamakazi header and it was insain

 

hell yeah! THATS what im talkin about!
thanks guys