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It sounds like you have an 07 or 08. The stock piping is dual 2", and that is rated at 275 HP. For a 300 HP rating, combined with our cubic inch motor, 2.25" is ideal. To maximize exhaust scavenging, you should also put in an X pipe with a dual system.
 

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itsmeboston said:
so i shouldnt go bigger than 2.25? i was thinking about going bigger because i want it loud. lol

No you shouldn't, unless you want to lose a lot of lowend torque.
 

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3" single after the Y is perfect, that is also rated at 300 HP where 2.5" single is rated at 275.. After the muffler doesn't matter in most cases.
 
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