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Old June 10th, 2014, 02:02 PM   #1
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how much more hp can a catback get me with these mods

How muh more power will a catback get me compared to stock.

My mods are
4 inch intake
Zdx tb
3.7 tl mani/3.5rl top plate
Ported intake runner and cylunder head.
Rl cams with j35a8 type s heads n valves and springs
Rv6 v3 pcd
Xlr8 j pipe
UR underdrive pulley


The twp exhaust im looking at is the magnaflow 06-07 sedan mpdified to fit to coupe because its 2.5 mid pipe or the coupe magnaflow 2.25 piping
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Old June 10th, 2014, 02:08 PM   #2
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Do custom 2.5" piping. The 2.25" piping will be restrictive for those mods.

Unless you want to do 3". But most people say the 3" exhaust is too loud... I know mine is... But then again i have no cats, no resonator, and 3" straight through vibrant mufflers.

edit: forgot hp guesstimate...

10-15whp... maybe more maybe less if your coming from a completely stock exhaust.
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Old June 10th, 2014, 02:25 PM   #3
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Since you have pcds and jpipe, maybe 10whp.
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Old June 10th, 2014, 02:47 PM   #4
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Also I think you will have more torque with the 2.5" vs. more top end with the 3"
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Old June 10th, 2014, 02:56 PM   #5
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Bro stop making these threads.
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Old June 10th, 2014, 04:34 PM   #6
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Oh my GOSH, the search button is like so ANNOYING!

Seriously, man. This topic has been discussed a gazillion times.
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Old June 10th, 2014, 05:19 PM   #7
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What... there's a "search Button ???
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Old June 10th, 2014, 06:53 PM   #8
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Gives 1000whp
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Old June 10th, 2014, 07:45 PM   #9
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Are we talking 2.5 duals or 2.5 single for low end?
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Old June 10th, 2014, 08:55 PM   #10
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Single
3inch to two 2.5
2.5 to two 2.25
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Old June 11th, 2014, 12:10 PM   #11
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^ I have a 2.5" Tsudo exhaust. It's 2.5" all the way through and it's not overly loud, but can still get annoying at times. You will have to take it to a shop and have them cut the Flange that connects to the Jpipe and turn it. The holes dont line up unless you do that.

We aint trying to bash on you, but really this topic has been covered many times. The search button does help cut down on clutter and repetitive threads.
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