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MAGNAFLOW 3" High Flow cats / 3" cat-back

9527 Views 45 Replies 13 Participants Last post by  jconnolly1119
400 rwhp ... so close but then again 397 is not so bad :)


MAGNAFLOW 3" CAT-BACK p/n 16642 / 3" HIGH FLOW CATALYST p/n 16420

Here are the numbers you have been waiting for:

Stock Baseline: 377 rwhp / 378 lb-ft
MagnaFlow 3" High Flow Cats: 386 rwhp / 389 lb-ft
MagnaFlow 3" High Flow Cats / 3" Cat-Back: 397 rwhp / 400 lb-ft

MAX HP gain: 24 @ 5300 rpm
MAX TQ gain: 25 @ 4700 rpm

PEAK HP gain: 20
PEAK TQ gain: 22

Our Cat-Backs tend to produce 11-15 rwhp (conservatively with others seeing up to 20) and the MagnaFlow High Flow Cats produce another 7-8 rwhp on their own. The combination nets 20 SOLID rwhp and across the entire curve. I'm sure additoional testing would have netted a 400 RWHP number but what is 2.2 rwhp :)

Thanks again to Chris (Cbutler32) for dropping by to have us faciliate the install and dyno. He was more than patient while we worked on our next TV appearance filming here at the MagnaFlow Tech Center but hopefully he was entertained while getting to observe the entire installation and testing. From the smile on his face when he was here I'm sure he's enjoying the ride home.
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Does your muffler act as an X-pipe, or is it chambered seperately?

Also, there are several companies selling high flow cats. Has anyone tried them, or is this a CARB issue with the Magnaflow system? I had thought about buying the Cat-Back and adding some high flow cats from Random Technology.
btlfed1500 said:
The X-pipe was tested but not needed for power in our system. The mid bed muffler is a shared chamber muffler which allows the necessary cross-over balance from each exhaust bank.

Currently, no one has CARB approval for the SRT8 6.1L for CA cars. Also, no one has a metallic core OBDII certified 49 state catalyst. The current pieces are "off-road" as are all market offerings. OBDII compliance is not the same as OBDII certified.
Thank you for clearing that up for me.
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