Did anyone else notice right after the cat, the 3" Magnaflow cat-back has a 1/2" long 2" section???

I'm curious if this is restricting anything in regards to flow? I'm planning on having it cut out and welded a 3" piece in there.

Curious if anyone did the above and had it modified...

 

I noticed, but I dont think it's that restrictive. If you want to do for sake of consistency (3in all the way) do it!

At least I dont think it will change all that much in the range of power the RA can handle.

 

That has been an "issue" (complaint) since the evo 8 came out too.

It's the 3" catback exhaust system that tapers down at the neck where it connects to the cat.
Most of the time the Cat opening is 2"-2.5" and that's why the pipe tapers there in order to not have a leak at that flange.

My thermal R&D catback on my evo 8 had that taper too. When I got a 3" downpipe and then testpipe. I didn't want to cut my catback and just replaced it with a new 3" catback. New style and sound.

For the ralliart, I'm sure you can fix the magna flow to 3", all the other exhausts are 3" straight through. (AMS).

 

Yes, I just had a CBE made with the Magnaflow, chopping off the restriction, and welding in a resonator.
It sounds so f-ing sick!
But yes the tapered end is there for stock cat bolt-up.

 

Yeah that's what I figured. It's one of those things that doesnt really matter but it's just eating away at me knowing its there hahaha!

I'll have to get it fixed soon.

Thanks for the input everyone

 

Any exhaust shop can whack it off and weld in a short 3" section. If you order through MAP it is an option right on their www site. I recommend doing this, for $50 on top of an already cheap exhaust it makes it 'perfect' for making big power.

 

Unfortunately, I didn't know about it in advance. I'll have to get it done at an exhaust shop but should be around $50-75 max.

 

Weird my magnaflow didnt have that big restriction...

theres like a half inch section thats a bit smaller then the rest right off the cat to cbe flange

Planning on loping it off to stick in a resonator as well... anyone got suggestion on which resonator works best?