2 1/4" or 2 /12" Flowmaster cat back?

MadMatt5oh · Mar 29, 2004

Hey people, sometthing terrible has just dawned on me. A few months ago I bought 3" long tubes with 2.5" reducers and a 2.5" o/r H. I havent driven my stang other than the initial ride home yet. I dont have a way to get under it far enough either! I know I have 2c flow catback with 2.5" tips. But Im worried that the stock exhaust of 2 1/4" will leave me with only a 2 1/4" catr back. My buddy says thats not true. That reducers had to have been used because flowmaster doesnt make a 2/4" cat back!

Is that true? If so, then I will have to get the cat back too because I dont want to bottleneck my performance making my upgrade worthless!

DropTopR · Mar 29, 2004

They do make a 2 1/4" system, cuz my friend has it on his car. As for the 3" long tubes, do you mean they have 3" collectors? Cuz if they do, it could be a bit of overkill on your car, and could actually hurt your performance. Check out the list on my car. And my headers are 1 5/8" primaries with 2 1/2" collectors.

Black331Stang · Mar 29, 2004

i dont get what u mean, but y get a stock size catback. just get the 2 1/2

cevtv · Mar 29, 2004

I think your smokin' crack. You are replacing everything in front of the cat-back that is on there, right? You already have a flowmaster cat-back that is 2 1/2" on there, right? If this is all true, then there will not be any of the factory exhaust left on the car.....what's the problem???

Mavrick · Mar 29, 2004

Ok guys.. this is what he is saying..

Bought headers with 3" collectors, and a 2.5" h pipe... he has 2.5" tailpipes with flowmaster mufflers, but he doesnt know if the flow tubes/mufflers are 2.25" or 2.5" - he wants to know if flowmaster makes a 2.25" catback.

Yes flowmaster does make a 2.25" catback, so your going to have to find a way under your car to find out what you have.

cevtv · Mar 29, 2004

Mavrick said:
Ok guys.. this is what he is saying..

Bought headers with 3" collectors, and a 2.5" h pipe... he has 2.5" tailpipes with flowmaster mufflers, but he doesnt know if the flow tubes/mufflers are 2.25" or 2.5" - he wants to know if flowmaster makes a 2.25" catback.

Yes flowmaster does make a 2.25" catback, so your going to have to find a way under your car to find out what you have.

What does it matter, then???? If the flow tubes ARE 2 1/4", they will bolt up to the 2 1/2" h-pipe, no problem...........

.

sldghmr · Mar 29, 2004

cevtv said:
What does it matter, then???? If the flow tubes ARE 2 1/4", they will bolt up to the 2 1/2" h-pipe, no problem...........

.

Tfhe 2.25 flowtubes become the bottle neck. Trust me, that's what I living w/ right now and it sucks.

Mavrick · Mar 29, 2004

cevtv said:
What does it matter, then???? If the flow tubes ARE 2 1/4", they will bolt up to the 2 1/2" h-pipe, no problem...........

.

He doesn't want the 2.25" flowtubes/catback to create a bottleneck in his system..

cevtv · Mar 29, 2004

Mavrick said:
He doesn't want the 2.25" flowtubes/catback to create a bottleneck in his system..

The way I read it, I thought he was thinking he needed a new cat-back..... OK, makes sense now.

Mavrick · Mar 29, 2004

Dont worry, i got a little lost in the origional post too

MadMatt5oh · Mar 29, 2004

Ok, Guy's after reading that I'll clarify!

My my has stock headers and H. Those are 2.25

It also has a Flow cat back which I wondered what size it was and still dont know.

The former owner was a Moron but took good care - just could have made better choices.

I have long tubes and a o/r H sitting in the closet.

Long tubes: 1 5/8 primaries with 3" collectors with 2.5 slip in collect reducers.

Mac o/r shorty H at 2.5

Is it possibel Numbnuts has a 2.5 cat back? I can't check for at least a month

cevtv · Mar 29, 2004

As far as I know, if it is an actual cat-back (and not just welded in mufflers), it should be 2.5" flow tubes if it has 2.5" tail pipes.

MadMatt5oh · Mar 29, 2004

cevtv said:
As far as I know, if it is an actual cat-back (and not just welded in mufflers), it should be 2.5" flow tubes if it has 2.5" tail pipes.

Yay!!! Thank you Sir!

88stangmangt · Mar 29, 2004

MadMatt5oh said:
Ok, Guy's after reading that I'll clarify!

My my has stock headers and H. Those are 2.25

It also has a Flow cat back which I wondered what size it was and still dont know.

The former owner was a Moron but took good care - just could have made better choices.

I have long tubes and a o/r H sitting in the closet.

Long tubes: 1 5/8 primaries with 3" collectors with 2.5 slip in collect reducers.

Mac o/r shorty H at 2.5

Is it possibel Numbnuts has a 2.5 cat back? I can't check for at least a month

what are the reducers for you dont need them my bbk long tubes bolt up fibe without that stuff.

cevtv · Mar 29, 2004

88stangmangt said:
what are the reducers for you dont need them my bbk long tubes bolt up fibe without that stuff.

He never said they are BBk's...........Regular long tube headers have a flat flange that the collector reducer bolts to.........they don't have a ball & socket connector.

MadMatt5oh · Mar 30, 2004

Yeah, they just come reducers to make it fit. I wish I knew more about headers before buying them Because my Mac H is socket fit. I may just get rid of these headers and get some Macs

bmorrisj · Mar 30, 2004

make sure you got the right short length h-pipe for those long tube headers.... other than that this is gonna be badass....

dvs bullet · Mar 30, 2004

Even if it is a 2 1/4 cat back it's not going to bottleneck your car with the list of mods you have, that what I have on my car and it's perfect. The only thing that you have to remember is that you choose parts that are mandrel bent, because if they aren't than you are dealing with a 2 1/4 pipe anyway because the bends are collapsed from 2 1/2 to 2 1/4. So if the guy got 2 1/4 mandrel bent tails then it would be just what you need, the intake and heads on the 5.0 are the most restricting.

MadMatt5oh · Mar 30, 2004

Thanks Guys,

Yes, I have a shorty H.

I'm not sure if my pipes are mandrel bent or not. The tail outlet is 2.5".

My fears are at ease I will keep my exhaust parts and 2 c flows.

My tails are painted blk on a blk stang so they keep me under the radar. I'll keep it that way this year and worry about cosmetics this year.

Chrome tails, about 2k of mods and cosmetic enhancements next year!

2 1/4" or 2 /12" Flowmaster cat back?

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