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I have Magnaflow HF cats, and ran them with my stock exhaust for 9 month before I went with Magnaflow Mufflers. I had no issue at all. I did pick up a little more hp by way of seat of the pants and I really like the sound better. I still have the stock reso's on it.
 

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I have Magnaflow HF cats, and ran them with my stock exhaust for 9 month before I went with Magnaflow Mufflers. I had no issue at all. I did pick up a little more hp by way of seat of the pants and I really like the sound better. I still have the stock reso's on it.
yeah the site in the link say 8hp... not bad for the cost of them...

how did the high flow cats sound with the stock exhaust...better?
 

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I gotta vid clip let me get for you.
 

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I got another Hold on.
 

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If I get the Chance I'll get one of the new set up with my ARIA, and now my CMR tune and Magnaflow mufflers.
 

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Would the mid pipes cause the same o2 sensor problem as headers? Would an aftermarket cat back add more to the 8hp than just more sound?
 

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You will need the Predator to turn off the rear O2 sensers, It will throw a code.
 

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Would the mid pipes cause the same o2 sensor problem as headers? Would an aftermarket cat back add more to the 8hp than just more sound?[/QUOT

With a CAI, HF cats and the 93 tune of the Predator you will be quite surprised how much more seat of the pants hp you will feel, I just cut out the suit case and added Magnaflow mufflers and I have notices a difference in the HP. It's Cheaper the a catback system and I keeped the stock resos.
 

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PA requires emissions. No thanks. I knew it when the MD Speed link said off road use only.
 
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