Hi, I'm looking into the dynomax shorties for my 87 iroc-z, which will be my new daily driver within the next month and a half. I am wondering about what ypipe that your using with the dynomax black jack shortie headers, Stock, aftermarket or custom? Thanks.

 

your stock one should work.

 

I am pretty sure that it won't. I believe they make a y-pipe that is sold separately for those headers. It should be cheap. There aren't any headers out there that attach to the stock y-pipe on our cars.

 

yeah thats what I figured, about the factory y fitting. I have the optional high flow y from the factory off my 89 formula 350, its a 3" thats in good shape still. But I would say that most likely, it would choke the headers, by running it.

Does anyone that has these dynomax headers happen to know where I could find the y for the dynomax headers?

I haven't been able to find a site for dynomax yet, and they don't have it listed in jeg's or summit, yet they sell the headers alone.

If I can't find the y for the dynomax's, I'll probably just opt for the flowtechs for 180$ complete, I've heard all the horror stories about them, but for 180$ there going to be way better than manifolds, and my 87 iroc-z's manifolds are cracked, and I'm not going to put my formulas old manifolds on, no way, lol. Thanks again guys.

ShiftyCapone, are you pretty happy with the flowtech headers, as far as fitment and installation?

 

Well there is a lesson to be learned here. There is so much truth the old saying "you get what you pay for." Fitment was not an issue and the headers slid right in. The smaller primaries do not bother me as well. What bothers me is the overll quality. The welds are very nice but the header flange was warped. This could be from the jig or could be from the coating. My geuss is how they were made. i had to install these headers and did not have time to wait to ask for a different set. Also the supplied gaskets are garbage and will flow out in like 5 miles of driving. So I had to spend some good money to get them to seal. I used the percy's dead soft flange gaskets and they helped make up the difference in the warped flange. The y-pipe is just horrid and looks like a high school shop class distaster. It is mandrel but it is a t-fitting that wasn't even cut right. If you looked down the t fitting you could see that it did not line up with the hole that was cut to mate to the rest of the system. A dremel took care of that but the problems continue. The collector flanges do not line up with the y-pipe very well and a big gap is formed. I have tried to stuff as many dead soft copper gaskets in there to fill the void but I think I made things worse. I got so frustrated I over tightend them doan and bent them leaving a small gap present and a permanent exhuast leak. I also do not like the way they sound. The car sounded much better with just the cat back and stock exhaust manifolds. They did make decent power but it was not worth the hassel. I cannot wait to get a set of modified Hooker 2055's, SLP's, or macs.

 

ok cool, thanks. I still might opt for the flowtechs, and I bet if I complain about some horror stories like you just gave me, maybe they will sell me a better set. Maybe I'll just search for the dynomax ypipe, or ask someone at jegs or summit, and see if they can find it for me. Both headers are basically the same as far as quality material, and primary size, but I guess I'll just have to wait and see.

thanks for your time to type all that, your info is appreciated.

Anyone else have a comment, please let me hear it.

 

Ok dude, do not get the flowtechs. I'm serious these things are crap. As soon as I get the money I'm getting either Hedmans or Hookers.

 

you think they suck that badly eh?

You have to remember I have a 89 formula 350 I'm going to be putting into the tens, so I'm spending 400$ on the long tube super comps for that car, but I'm building my daily driver iroc, on more of a modest budget, and I want to keep the headers with y pipe under 250$. But If I can find a ypipe for the dynomax's and its not too much, I'll pick those up.

 

Yea they really are that bad. You will have a hard time jkeeping the collectors from leaking when used on a daily driven car. I have had my headers for about 1.5 years now and I still can't get them to seal after only about 600 miles of driving in that time. I can't even imagine driving the thing every day. The old saying "you get what you pay for" unfortunatley still applies to daily drivers as well.

 

Okay I have dynomax shorties on my 86 camaro and that is the trouble that I am haveing. There is no aftermarket y pipe. You will have to go to a exhaust shop and have them make you one. It is abought $100.00 I do not have that kind of money. Listen do not run the car very long with out the pipe, It will bend every valve in the heads trust me I know. Have great luck out of the headers though. Thay are kinda hard to put in since we have such a tight fit. Hope this helps you. Good luck. If you find a aftermarket le me know I will buy one if it is under $100.00

 

Yeah dude for real, they suck. I've got them on my daily driver and they drive me nuts. If there is an exhaust gasket out there I've tried it. They all leak. Not to mention all the fabricationg I had to do on them. Some of the bolt holes didn't match up. I would go with anything but the flowtechs. Oh and getting the spark plugs, ha, forget about it. Better have and entire day set aside. But thats just my two cents. On a daily driver go cheap but not flowtech cheap.

 

hmm, I think I'll just buy the dynomax's then, after all the bad luck you guys have had, I would have expected more out of them, but damn, maybe I'll just have to call up holley and bitch them out for all of our sakes. thanks again guys.

 

I'd say leave Holley alone. They have a quality alternative, Hooker 2055.

This is one of those areas where you might as well get it right the first time. Sure, the Hooker cost more than the Flowtech or Dynomax, but you get more, too. If it takes you a couple of months to save the extra money for the Hookers, then do it. Better right later than "wish I woulda" sooner.

 

Well, like I mentioned earlier, this is for my beater 87 iroc-z, but it won't run like a beater, I'm buying the super comp hookers for my 89 formula 350, high 10 second weekend warrior. I'm building ny iroc to run mid 13's when I put a cam in later on. I don't really want to spend much more than 250$ on the shorties and y for the iroc, so.

 

I talked to a tech associate from summit racing. I learned a few things, lol. As far as The flowtechs and the dynomax, black jack, and summit racing shorties, they're all made by holley, they are all the same headers, and are only in different boxes, so 133$ for dynomax, 89 for flowtech, or 79 for summit, and you use the flowtech y pipe and shazam, you have a nice little setup for 180$, and some frustration.

He also mentioned that blackjack was bought up by dynomax, between 93-94.

I just thought I'd let you know, so I'll simply buy the summit shorties, and flowtech y, and I'll be set, aight gotta go, just wanted to let you all know.

 

That guy is wrong. The Flowtechs and Dynomax headers are not made by the same company.

Dynomax and Blackjack are both made by Walker. Flowtech is owned by Holley.

Blackjack headers have always been made by Walker/Dynomax. Even when I was in high school (1984-89).

They are not, nor ever will be the same company, nor share any products.

I've heard that the Flowtechs and Summit's are the same, but the Dynomax are not. I've seen the two before (Dynomax and Flowtech) and they're not the same at all. Not even close.

Another Summit pimple face spewing out false information.

 

custom made, $100

 

I was told they are all the same headers, and all are made by flowtech(holley) for summit, flowtechs and dynomax. Thats why the y fits.

Also how many of you have tried the summits or dynomax's with the flowtech y? If not, how would you know that it won't fit?

 

I never said Flowtech's Y-pipe wouldn't fit.

Both my Camaro and my wife's Mazda fit in our garage, but that doesn't mean they're made by the same company.

Shorty headers are made to replace stock manifolds, and fit in stock loctations. If they happen to fall within 1" of each other, you can probably manuverate the Y-pipe enough to make it fit.

A slight bend here, and tweek tweek there... and voila. But as I said, Holley (aka Hooker) and Walker (aka Dynomax) have never been associated with each other.

They're like Coke and Pepsi... Chevy and Ford... Cable and satelite... Domestic and Import... Tasts great / less filling.

Put it this way. If Holley bought Walker I'd be very, VERY surprised.

 

I'm going to call holley, and dynomax up tomorrow and see for myself if its the truth. I don't see why someone would want to lie, I was on the tech line not the order line.

 

I'm not saying he lied. Quit putting words in my mouth.

I'm saying he's MISTAKEN!!! Not lying. Big difference.

Always remember this...

Service "techs" at places like Summit and Jeg's are not "techs". They're sales people. They get paid by the hour, plus commision. They're human, and make mistakes. They're not always 100% right. More than half of them have never touched a wrench in their life.

That's what I'm saying.

 

just spend a tad more and get hedmans.....
shorties.... HED-68470 ~$120 summit
y-pipe....... HED-17470 ~ $95 summit

from what ive heard they blow away flowtechs and i asume dynomax as well its still under your 250 budget too.

 

The flowtech headers are the same as summit. The dynomax headers are completely different as AJ_92RS stated. I have the flowtechs and they are different than the dynomax. The collectors are different and the flowtech y-pipe will not work with them. Contact ACS because they will have all of them in front of them and they should re-affirm this to you as well.

 

I was talking to a manager today of summit, and was telling them how you guys told me I was crazy and wrong, because I was listening to him. When I told him this, he was upset, because all the tech guys they have either went to college, or they sent to colllege. So I'll just call them up and ask them, I'm sure they'll be able to give me a straight answer.