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  #1  
Old 06-25-2012, 10:33 PM
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magnaflow Y pipe who has used it

so like the title says the magna flow y pipe with hiflow cats has anyone here used it or have any info on whay kinda of gains to expect on a 4.7 jeep wk
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Old 06-25-2012, 10:44 PM
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Re: magnaflow why pipe who as used it

Maybe none. When I had the headers built for my 5.7, I asked about high flow cats. The guy told me that all the new ones are high flow, wire spun (whatever that means) cats. and he didn't recommend changing them. I didn't and it seems to work fine. About 5 years ago I did put JBA high flows on my Hemi LX and didn't really feel any noticeable difference. If in doubt, you may want to have your local muffler shop do a backpressure check before and after the cats. They should be able to tell you if they're working efficiently.
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Old 06-26-2012, 05:30 PM
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Re: magnaflow why pipe who as used it

i was more curious about the pipe it self adding power.
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Old 06-26-2012, 09:53 PM
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Re: magnaflow Y pipe who has used it

A couple comments. If the "Y" pipe on the 4.7 is similar to the one on the 5.7 (has the cats. on it), the only choke point in the pipe was where it connected to the exhaust manifold. On the Hemi, that size was 1 5/8 in. Quite a difference between that and 3 in. When they did my headers (they have 3 in. collectors), it is now 3 in. from the collector to the tail pipe. Maybe someone more familiar with the 4.7 exhaust manifolds and "Y" pipe will chime in and say whether there is a similar restriction. If the exhaust collector is the same size as the pipe, you probably won't see any difference.
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Old 06-27-2012, 12:13 AM
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Re: magnaflow Y pipe who has used it

well im fairly certein that the y pipe on the 4.7 is garbage after a few conversations with flyin ryan
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Old 07-08-2012, 05:51 PM
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Re: magnaflow Y pipe who has used it

I used the magnaflow x pipe SRT8 setup on my 5.7 for awhile... it was loud and threw codes... I eventually hacked my original cats apart and welded them with 2.5 pipe and the magnaflow 2.5'' y pipe... no more codes. I have two 3'' in/out magnaflow cats if you wanna experiment with them
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Old 07-08-2012, 05:52 PM
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Re: magnaflow Y pipe who has used it

the original 5.7 y pipe is much more restrictive than the magnaflow y pipe
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