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2004 SRT-4
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Discussion Starter · #1 ·
So I have the Borla cat-back sitting in the basement (still in the box), but haven't opened it yet to check it out.

I was thinking about adding the NeedsWings catted 3" downpipe to go with it. The Borla cat-back has the 2.25" inlet, which would mate up though.

My idea: have the reduction/end on the Needswings DP be 2.5" (they said they could do that) and then eliminate the 2.25" inlet on the Borla cat-back and then mate them up (weld on) with a V-band clamp connection.

So that way it's 3" down to the 2.5"
VERSUS 3" to 2.25" to 2.5" (which has that bottleneck)

Is this possible to do with the Borla exhaust?
I'm assuming it's just got a reducer or something on the front section of pipe that I could cut off and replace with 2.5" pipe if needed.
 

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Discussion Starter · #4 ·
I mean, is it "worth it" to remove that 2.25" bottleneck section though?
I might even add the 3" O2 housing btw, so it'd be 3" then down to the 2.5" for the cat-back -- i.e. more consistent
 

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Discussion Starter · #5 ·
So, follow up here, Needswings is local to me and will put the 2.5" end on their downpipe and leave it as a slip fit connection....saying that I just need to trim the reducer inlet off the front of the Borla cat-back and then they'll slide together.

I think I'm gonna go that route
 

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So, follow up here, Needswings is local to me and will put the 2.5" end on their downpipe and leave it as a slip fit connection....saying that I just need to trim the reducer inlet off the front of the Borla cat-back and then they'll slide together.

I think I'm gonna go that route
Will that affect where the tail pipe sits? You may potentially want to add back whatever you remove.
 

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I have the Needswings catted downpipe (w/ cutout) to the Borla catback exhaust. No modifications were needed. I also added the electric cutout because I'm old and lazy. On demand UPS truck noises.
 
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