Exhaust Size?

[firefighter184]

I need to know the diameter of my exhaust piping so the guy who's going to fix it for me tomorrow can get the stuff, but my Blazer is at home and I'm at work. It's an 89 K5, 350 motor, as far as I know stock single rear exit. The damaged area we're going to replace is the y-pipe off the passenger side before it joins up with the driver side. I'm, thinking 2 inch, but want to be sure...

 

[George_Pimpdaddy]

i believe mine was 3" the single factory exhaust same year k5 too

 

[02turbogixxer]

Yeah I think it will be closer to 2" if it is before it meets the drivers side. 3" seems REALLY big for a stock y-pipe.

 

[4xcrazy]

I think the y-pipe part is 2.5", 2 1/8th something like that, and then goes to a 3" into and out of the Cat,,,,i made this mistake when getting pipe reapplied from the muffler to the tailpipe for emissions, thought it was 2.5" all the way back, then i saw the dude flaring it out to fit, oh well, new exahust soon anyways.

 

[02turbogixxer]

I think the y-pipe part is 2.5", 2 1/8th something like that, and then goes to a 3" into and out of the Cat,,,,i made this mistake when getting pipe reapplied from the muffler to the tailpipe for emissions, thought it was 2.5" all the way back, then i saw the dude flaring it out to fit, oh well, new exahust soon anyways.

Your exhaust might have been 2.5" but if he was using exhaust clamps then the 2.5" pipe that you bought would not fit over the existing 2.5" pipe that was on your truck. That would be the reason he would have flared it out. If he was welding it then he shouldn't have had to flare it out unless of course it was 3" that was already on your truck.

 

[4xcrazy]

oh no,,,it's a serious flare i'm talkin about here, like 1/2" all the way around, not the little flare to make a slip out of it definately 3" factory stuff on there.

 

[sandawgk5]

When I talked to Mudfrog about a cat and muffler for my K5 he told me the stock is 3" as I wanted to go 3" cause I thought it was larger than stock. The PO apparently wanted to save a little cash or something cause my y pipe is like 2" and the main is only like 2.5. I am gonna replace it with 2.5 y and 3" with High flow cat and a super 40

Ira