custom y-pipe help... DIY'ers

[38SHO]

ok so I might want to make a custom catless y pipe for my ATX.........

one of my bigger problems is this..... what do I use for flanges to the manifold? I have a spare y-pipe, should I cut them off of that then put them onto the new, mandrel bent tubing? This would be a little tricky but possible... I think it would be the most reliable, best sealing way to go.........

thoughts?

anyone done this before?

 

[strings1732]

Most exhaust shops will be able to flare the ends of a pipe so it will bolt up. Just make sure you either install the mounting ******(the thing you bolt to the mani's) before you have the ends flared, or get the ones that can be bolted together afterwards.

 

[38SHO]

yeah I guess thats good thinking, I could do that too.... BUT, I was just thinking the OE ford ones would seat better.......I don't think it would be a restriction as it has to pass through the stock manifolds anyhow

 

[GoofSHO]

SHOBros. Replacement Y-pipe is back......


B

 

[strings1732]

yeah I guess thats good thinking, I could do that too.... BUT, I was just thinking the OE ford ones would seat better.......I don't think it would be a restriction as it has to pass through the stock manifolds anyhow

A good exhaust shops flared ends would seal fine. but if you wanted you could cut the ones off another y-pipe and weld it to the new piping. As long as there was not to much it wouldn't be much of a restriction. maybe an inch or so, I think, would be ok.

 

[strings1732]

SHOBros. Replacement Y-pipe is back......


B

not for the ATX...

 

[38SHO]

or catless

F a cat! we don't need no stinken emissions down here in Florida!

 

[strings1732]

LMAO! I have 3 Cat's, one is my girlfriend and the others are hollow

thanks to the prybar last night at least
/\
I
I
I
I

The hollow ones not the girlfriend. lol

 

[NotSoSlowSHO]

one of my bigger problems is this..... what do I use for flanges to the manifold? I have a spare y-pipe, should I cut them off of that then put them onto the new, mandrel bent tubing?

Dont use the stock y-pipe flares. But do use the flanges.

All i did was take a short (12 inch) peice of pipe into an exhaust shop and had them flare both ends. Then i cut the pipe in half, and used them as the starting point for the y-pipe.

 

[38SHO]

ok so keep the parts the studs go through but just flare new piping and go from there?

 

[SHOtime2511]

ok so keep the parts the studs go through but just flare new piping and go from there?

your going to loose what low end tq you have if you do this.
ive been down this road before on my old 89 and i hated it.
it was no fun below 4K rpms and it sounded like ass

 

[NotSoSlowSHO]

ok so keep the parts the studs go through but just flare new piping and go from there?

yep, that way you can use whatever diameter pipe you want.

 

[strings1732]

your going to loose what low end tq you have if you do this.
ive been down this road before on my old 89 and i hated it.
it was no fun below 4K rpms and it sounded like ass

I actually gained power at the low end with a catless. Everyone should, you just don't gain as much as you would with a high flowing catted y-pipe. It's a common misconception that you lose low end power. You still gain it just not as much as you could. But the top end you gain more than you would with a catted. It's a trade off, a little less low end for more top end or vise-versa. either way you still gain at the low end. but this is for a manual car and I don't know what the gains are to be had on an ATX.

 

[SHOtime2511]

I actually gained power at the low end with a catless. Everyone should, you just don't gain as much as you would with a high flowing catted y-pipe. It's a common misconception that you lose low end power. You still gain it just not as much as you could. But the top end you gain more than you would with a catted. It's a trade off, a little less low end for more top end or vise-versa. either way you still gain at the low end. but this is for a manual car and I don't know what the gains are to be had on an ATX.

i think it depends on the Y-pipe,i here lots of people echo both our statements.all i know is with the setup i had it was a noticeable loss in low end tq vs a stock Y

 

[38SHO]

I think I'm going to do 2" and that might help with the loss of torque........

say what u want but every other car I took the cats off of helped, they are a restriction..... can't really put it any other way if you don't understand that...

lets just give one instance, and don't bring up because they don't have to pass emissions.... how many true race cars do you see that run cats? When was the last time u saw a F1 car run cats? When they spend millions of dollars making more power, if cats helped make power don't you think they would add them?

plus I don't really care about loss of low end torque.... it will have enough, its no v8 after all.... I'm looking for peak horsepower, or atleast mid-range to peak HP 5-7krpms..........

and the more I listen to videos and such.... I like how catless SHO's sound, they sound a shitload meaner and louder, some people like that

 

[NotSoSlowSHO]

i think it depends on the Y-pipe,i here lots of people echo both our statements.all i know is with the setup i had it was a noticeable loss in low end tq vs a stock Y

Until you have a dyno to prove otherwise, Ill say your claim is a bunch of BS.

The entire "catless looses low end" has become somewhat of an urban legend

The entire thing started with (IIRC) SHOshop Y-pipes, comparing their two pipes . ONLY their pipes. The catless provided abit less torque down low than the catted pipe did. Although, the catless also provided MORE high end HP. NONE of this had ANYTHING to do with a comparison to a stock y-pipe. And there is a big reason, both catless and catted aftermarket pipes improved both hp and torque when compaired to the stocker.

 

[NotSoSlowSHO]

I think I'm going to do 2" and that might help with the loss of torque........

What other mods do you have? If you have a ncie list of mods, or plan on more mods, Id suggest you go with 2.25 pipes.

And depending just how far you want to take the car, you will need to decide what size collector you want to use, to match up to the rest of the exhaust.

 

[38SHO]

welp I want to run a shot of nitrous

a zex kit, anywhere from a 75-125 shot

I might make a custom side exit exhaust, straight through muffler prolly 2.5" with 1 45 degree mandrel bend in it... If I can sell my dynomax catback at a decent price, I would defintely do this

I have a K&N cone filter

and I will also have BBB's by then

thats all I'm really planning, maybe I'll get honed manifold, but that can cost almost as much as I can find another SHO for.............

I really want a rust free MTX sho to turbocharge and go insane on that one...

on the bottle I'd like to see 300whp running the bigger shot

 

[smokin joe]

A good exhaust shops flared ends would seal fine. but if you wanted you could cut the ones off another y-pipe and weld it to the new piping. As long as there was not to much it wouldn't be much of a restriction. maybe an inch or so, I think, would be ok.

i flared the ends on mine all you need is to get the last 1 inch glowing and then you need something metal that will give you the same flare Mine works good its not as hard as some may think

 

[SHOtime2511]

Until you have a dyno to prove otherwise, Ill say your claim is a bunch of BS.

The entire "catless looses low end" has become somewhat of an urban legend

The entire thing started with (IIRC) SHOshop Y-pipes, comparing their two pipes . ONLY their pipes. The catless provided abit less torque down low than the catted pipe did. Although, the catless also provided MORE high end HP. NONE of this had ANYTHING to do with a comparison to a stock y-pipe. And there is a big reason, both catless and catted aftermarket pipes improved both hp and torque when compaired to the stocker.

think what you want,all im saying is that the Y i had did loose tq over my stock y pipe,it was noticable to me.like i said i think it may depend on the Y-pipe itself,maybe some do and some dont,but mine did,simple as that!