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400 4spd. · 07-15-2008, 06:43 PM

I'm glad to see that it worked out. I admit that when I first looked at my down pipes I wondered which of those would be the left and which the right side. It looks like another benefit will be added clearance to access the starter.

wh33lman · 07-30-2008, 12:50 PM

I had the same problem with my Pypes downpipes.
They eventually sent me some specs/tolerances for the "J-Bend" .
After following their instructions to place a straight edge on the bottom of the pipe, and then measure to the top of the flange, it was determined the pipe was out of spec, and I was sent another downpipe.
All three downpipes had quite different measurements for this specification.

http://forums.maxperformanceinc.com/...23#post3011323

Ccass · 03:03 PM

Quote:

Originally Posted by wh33lman

I had the same problem with my Pypes downpipes.
They eventually sent me some specs/tolerances for the "J-Bend" .
After following their instructions to place a straight edge on the bottom of the pipe, and then measure to the top of the flange, it was determined the pipe was out of spec, and I was sent another downpipe.
All three downpipes had quite different measurements for this specification.

http://forums.maxperformanceinc.com/...23#post3011323

Just and fyi to readers who are starting to be paranoid that Pypes downpipes don't fit. In this situation, the Pipe wasn't out of spec, it was a mislabeled chevy downpipe.

Pypes has delivered probably 1000 pair of downpipes for both HO/RA and standard manifold installations and we have yet to have a defectively bent pipe. The limited problems stem from several misboxes, downpipes being put on cars we havent' tested and various customer car modifications that changed the exit position of the manifolds.

wh33lman · 08-01-2008, 02:54 PM

Like Cass said...there are 2 important facts here:
1) there is a spec for the "drop-length" of the downpipe from the flange, and;
2) Pypes recognized the error and shipped out another.

tripwr1964 · 08-10-2008, 08:18 AM

what is the proper down-length for an a-body downpipe?

pontiacpetey · 08-10-2008, 09:59 AM

I smashed mine in the first few weeks they were in, I had a pro shop install them. I wish they still made the regular pipes, now I have to get the stainless replacement ones for 100+ bucks.
Otherwise a nice system.

ClassJ · 08-15-2008, 01:30 PM

So to make it fit tighter as you have. What side got the -1 pipe and what side got the -2 pipe?

thanks
Nick

tripwr1964 · 08-19-2008, 07:09 AM

Quote:

Originally Posted by ClassJ

So to make it fit tighter as you have. What side got the -1 pipe and what side got the -2 pipe?

thanks
Nick

nick, i have know idea which pipe is/was -1 or -2. they were not marked.

Jim Cody · 08-19-2008, 12:18 PM

I am surprised to read that Pypes sent you specs concerning the length of the downpipes. I was just told My 73 Pontiac GrandAm was an unpopular car and that I should have expected that the system I bought would need modifications. The down pipes didn't fit a all. I had new ones made and still have to modify the tailpipes. This was two years ago and it just has taken the wind out of sails and I haven't been able to dive it.

tripwr1964 · 06:30 PM

FINALLY getting around to fitting up this system to my liking. Thought i'd start with the down pipes, then weld the x-pipe, and finish with my pypes 2.5" splitters that have been collecting dust. Anyway, from my previous post the passengers side downpipe was a little too low for me. wanted to raise it then tuck up the x-pipe better. with the 2.5" pipe, radius, and flange requirements most flaring tools need a certain amount of straight length. so only other option was an idea from b-man, cut a section out and reweld the flange. i am a pretty ****ty welder, but the end result is what i wanted. cut 15/16" from passengers side downpipe, now they are both tucked up nicely.

tripwr1964 · 03-15-2012, 06:26 PM

installed pics

Jim Doran · 03-17-2012, 10:16 AM

Nice Job. Mine are too low and I need to do the same mod. Sounds like just shy of an inch or so is about right. Did you only cut the passenger downpipe ?

Greg Reid · 03-17-2012, 10:56 AM

...and what did you use to cut it with? I'm wondering if I'm capable enough to cut one that straight with a sawzall...

tripwr1964 · 03-17-2012, 05:27 PM

Jim, only the passenger side was cut, drivers was 15/16" higher. now i am not sure which downpipe ended up on which side... i fit them several times swapping them back and forth.

Greg, just a cutoff wheel with tape for guide. them angle grinder with 60grit flap wheel to smooth out the cut and knock down my expert welds. have to smooth out the welds to get the flange over it. also used .030 ss wire, not sure you need it...

Greg Reid · 03-17-2012, 08:50 PM

Ok, thanks. I'm putting mine on my '68...hopefully, it'll fit ok without any 'adjustments'.

rexs73gto · 03-18-2012, 01:43 AM

Jim cody , I have a 73 GTO with e-heads & round port exhaust manifolds , & I used the down pipes from pypes & they fit really well. I have the 2.5" pipes & an x-pipe which sit really high & nice. Your body is the same as mine. I put the down pipes on first & they hung just right, then I put the 2 angle pipes on to the x-pipe, took them off welded it up off the car. Now here is where I modified mine a bit. I bought some of the slight s-bend pipes with the flange on them cut off the flange & after the x-pipe put these pipes on which truned the pipe up a bit putting the mufflers up in the foot well where they where from the factory then put on the tail pipes which fit great. The flanged s-pipe I think is the anwser for you.

PaulatFast · 03-18-2012, 04:01 AM

Pypes downpipes don't need any massaging to fit well. We have installed in excess of 50 systems and NEVER had an issue. The reason the op had the problem is because he has the headpipes on the wrong sides... Who knows why his car required this. Or IF it actually did require this..

tripwr1964 · 09:05 AM

Quote:

Originally Posted by PaulatFast

Pypes downpipes don't need any massaging to fit well. We have installed in excess of 50 systems and NEVER had an issue. The reason the op had the problem is because he has the headpipes on the wrong sides... Who knows why his car required this. Or IF it actually did require this..

1) respect - u post on my thread as if iam an idiot
2) 2.5" pipe will never have the same bend radius as factory downpipes, so they are going to hang lower. fact
3) nothing special will my app, #62 heads and 2.5" RA cast manifolds.
4) pypes guy said u can install them either way. maybe i received wrong p/n, or not to print pipe. this is just my experience with 1 system.
5) we all have different standards, sure mine are different than yours!
6) just trying to help some of the other folks that have had similar issues by posting some solutions. obviously you've installed 50 plus systems with no issues, not sure why you'd even read this post.

nachomax · 03-21-2012, 05:24 PM

Any issues with the aluminum flanges?

rexs73gto · 03-22-2012, 12:14 AM

I have had bad experince with them. I had 2 sets of the alum, 1 at a time. After the 4th one was installed & broken OPG finially swapped out the alum one's with the cast ones & I have had no problem since. The alum. ones kept breaking at the bolt holes. I would get them on & when I trid to tighten them up one side would always break. The reason I say it was one at a time was I had 2 sets & broke them one at a time trying to put them on. Don't use the alum. ones they are junk, make sure when you buy the flanges they are the cast ones or send them back as they will break. I was putting mine on with a 1/4 inch rachet & spckets & just kind of sneeking up on them to tighten them down but as soon as you get close to getting them tight POP they break on one side or the other. Don't use them Send them back.

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