[HWYSTR455]

I can say that I will never again run the Doug's 2" round ports, the bolts are a PITA. And the fit isn't that good either. I had to beat a couple spots.

I have to drop the starter to tighten 2 bolts as well.

Biggest issue I have with them is the collectors don't point straight back, they are slightly angled. By the time you get to the back of the car with a full exhaust, you will never get the tips to point right (thru the valance). Or even get it to exit behind the bumper.

That one funky tube that wraps over the filter sux too, I have to tip the filter to get it out when changing and dumps oil on the end of the tubes/collector.

I have a set of 1 7/8 that I'm trying to psych myself into installing, that part is taking the longest! I will have to rerun the X pipe and straight sections too. Not fun laying on your back.



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[Formulajones]

The biggest chassis header we run on our stuff is 2". Worked well on Dad's 571. They are just out of the box hooker super comps and used them on the dyno with an exhaust system and made 724ho 764 tq with them. They fit the car nicely, don't hang low. Exhaust is a custom 3 1/2" from headers into a dr gas X that changes to 3" from there.

My 598 also uses 2" hooker super comps and made 786hp 772 tq. Again just out of the box chassis headers that fit really well. Same exhaust system..

When you get into bigger header tubes, at least on our cars, they all seem to wrap one tube around the frame and the inner fender needs to be cut. No thanks. So we stick to 2" headers. They are just street cars and don't need anything fancier.

We run electric cutouts on everything including these 2 examples. Not for performance but mainly for fun. In fact my 598 on back to back passes ran exactly identical passes through the exhaust vs cutouts open. So the system seems to be working well enough on that setup.

[78w72]

Originally Posted by ta man

I just spoke to my buddy Andy (Torquewar) he has ran the 1 7/8 Doug Roundport headers for years ..great fit and clearance. His car runs pretty decent too!

Thanks for the info, a few others have said the dougs 1 7/8 fit great and have very good clearance & bolt access... but another guy says they are horrible and wont even allow the rest of the exhaust to install and line up...

Originally Posted by HWYSTR455

I can say that I will never again run the Doug's 2" round ports, the bolts are a PITA. And the fit isn't that good either. I had to beat a couple spots.

I have to drop the starter to tighten 2 bolts as well.

Biggest issue I have with them is the collectors don't point straight back, they are slightly angled. By the time you get to the back of the car with a full exhaust, you will never get the tips to point right (thru the valance). Or even get it to exit behind the bumper.

That one funky tube that wraps over the filter sux too, I have to tip the filter to get it out when changing and dumps oil on the end of the tubes/collector.

I have a set of 1 7/8 that I'm trying to psych myself into installing, that part is taking the longest! I will have to rerun the X pipe and straight sections too. Not fun laying on your back.

So far everyone that has used the dougs 1 7/8 O-port says they install & fit very good and have good bolt access. First Ive read about those problems, Wonder why you had so many issues with them? But thanks for the reply. PS- if youre getting oil on the headers removing the filter, you can wrap a rag or alum foil around that area of the header and also put a zip lock bag around the filter when removing, catches any oil that comes out the filter... been changing my oil/filters that way for 25+ years with no spills or oil getting on the headers.

Originally Posted by Formulajones

The biggest chassis header we run on our stuff is 2". Worked well on Dad's 571. They are just out of the box hooker super comps and used them on the dyno with an exhaust system and made 724ho 764 tq with them. They fit the car nicely, don't hang low. Exhaust is a custom 3 1/2" from headers into a dr gas X that changes to 3" from there.

My 598 also uses 2" hooker super comps and made 786hp 772 tq. Again just out of the box chassis headers that fit really well. Same exhaust system..

When you get into bigger header tubes, at least on our cars, they all seem to wrap one tube around the frame and the inner fender needs to be cut. No thanks. So we stick to 2" headers. They are just street cars and don't need anything fancier.

We run electric cutouts on everything including these 2 examples. Not for performance but mainly for fun. In fact my 598 on back to back passes ran exactly identical passes through the exhaust vs cutouts open. So the system seems to be working well enough on that setup.

My 2" HSC fit nicely, good bolt access as well as easy to get a full size filter in/out... just hang to darn low for a car that isnt even very low compared to some other "pro tour" type cars Ive seen.

Thanks again for the info on this almost 9 year old thread, the power/flow info is great but the other thread was mainly to get input on how the dougs fit, I can get a good deal on some used coated ones so wanted to ask how they fit & of course perform. Sounds like 1 7/8 is more than enough for my power levels.

[Formulajones]

Seems to depend on the car. On A-bodies the hooker 2" headers tuck up nicely. On an F body not so much. Likely because F bodies just don't have as much room to snake 2" tubes through the chassis. In those cases the 1 7/8 have a better chance. I had 1 5/8 hooker super comps on my 2nd gen F body for years and they tucked up so nice you couldnt even see them. I doubt a 2" tube would fit as well.

[HWYSTR455]

My comments about fit etc were specifically the Doug's D522 A-body 2" round port headers. I've run the 1 7/8 ones and they are great. That's why I'm dropping back to them.

I do wrap foil around the end of tubes/collector area when I do a filter swap, but you have to snake the filter out of there around that one tube and it has to almost go completely horizontal to get it out.

I think I posted pics here of those issues.

The F-body 2" round ports (D523) don't have that wrap around tube, and believe I had those on my bird at one time. I honestly can't recall if I had any issues with them, but if I did, I would probably have posted here about it. I have a set of Doug's 2" for my bird, will comment on this thread when I install them.

https://pertronixbrands.com/products...eramic-coating

Both cars I've run hedmans, hookers, and a few others, both D and round port. Many of the D port ones weren't coated, it was back in the day when the manufacturers didn't offer it. Headers were so inexpensive, if they got flattened whatever, you just pitch them and get another set. Pretty sure the Hedmans were under $100 a set for the longest time, most others were in the same basic price range. As I recall, every header needed doctoring in that day.

If I were to need another set for the GTO, I would def try the 2" hookers again. Not sure the impact on performance since it is a larger displacement and higher flowing heads, but for the moment, I just don't feel like mucking with it, I still have other stuff to dial in.



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