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Old 03-11-2014, 02:52 PM   #1
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exhaust pipe size question

I have bbk longtube headers which have 2 3/4 collectors at the end and bbk catted x pipe which is 2 3/4 piping but the over the axle pipes that start after the xpipe and go to the axlebacks is that suppose to be 2 1/2 or 2 1/4? I cant remember and thought i seen the borla ataks with both 2 1/4 and 2 1/2 inlets for the 11+ mustang v6. anyone have the MRT catted H pipe? im still trying to decide if i wanna replace the bbk x pipe for the MRT h pipe.
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Old 03-11-2014, 10:21 PM   #2
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I'm pretty sure stock is 2 1/4 OTA pipes. I think catbacks come with 2 1/2. Does MRT have a shorty h pipe? Why not look into getting a custom o/r h pipe fabed to fit the LTs. Or if u really wanted catted reuse the bbk cats with a custom h pipe.
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Old 03-12-2014, 09:45 AM   #3
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I also believe that the stock 3.7 V6 diameter is at 2 1/4.

To be absolutely sure, PM Dan at American Muscle to verify.
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Old 03-12-2014, 08:20 PM   #4
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Quote:
Originally Posted by bucko View Post
I also believe that the stock 3.7 V6 diameter is at 2 1/4.

To be absolutely sure, PM Dan at American Muscle to verify.

+1

Someone else was trying to sell their Magnaflow Streets catback recently, and it thought if I could just get their midpipes I could add it to my Streets axle-back but they said it wouldn't work. Reason being, my axle-backs had 2 1/4" inlets to match up to the stock 2 1/4" midpipes. The Streets catback were 2 1/2" pipes and mufflers. Something else to think about when buying mufflers. If you eventually want to get rid of those stock midpipes, you better buy the full catback right away or you are going to be stuck with an extra set of 2 1/4" mufflers later.
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Old 03-12-2014, 10:38 PM   #5
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Originally Posted by GrabberMeBlue View Post
+1 Someone else was trying to sell their Magnaflow Streets catback recently, and it thought if I could just get their midpipes I could add it to my Streets axle-back but they said it wouldn't work. Reason being, my axle-backs had 2 1/4" inlets to match up to the stock 2 1/4" midpipes. The Streets catback were 2 1/2" pipes and mufflers. Something else to think about when buying mufflers. If you eventually want to get rid of those stock midpipes, you better buy the full catback right away or you are going to be stuck with an extra set of 2 1/4" mufflers later.
Or u can just weld the mufflers to the midpipe.
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