PONTIAC Maddog Pontiac Headers Install in 79 GP

[CDUNIGAN1981]

Anyone have advice for flexpipe fro. These 3.5" collectors?

You can see the angle of Driver and Passenger sides are not the same. I have also heard flex pipe between headers and pipes is good bc it does add unnecessary pressure against your headers.

I thought I could find 3.5" to 3" flanged flexpipe but am not having luck.

 

[Streetbu]

I'd use a 3.5" to 3" reducer, then this.

https://www.amazon.com/dp/B003VC9K64/?tag=gbody-20

 

[CDUNIGAN1981]

I'd use a 3.5" to 3" reducer, then this.

https://www.amazon.com/dp/B003VC9K64/?tag=gbody-20

Copy that
Why make 1 piece when you could sell a guy 2?!

 

[fleming442]

Copy that
Why make 1 piece when you could sell a guy 2?!

I just looked around a bit, it looks like he nailed it.

 

[CDUNIGAN1981]

How close would a LS exhaust system align up with my Pony setup?
Anyone have anything to add?

Also, arguments about 2.5" vs 3"

 

[Streetbu]

Plan on making over 450hp or looking for every last tenth on the drag strip? If so, go 3". Otherwise, 2.5" is a little friendlier to run and fit over the rear axle. Yes 3" is done all the time, but its definitely a tighter fit.

 

[fleming442]

I don't see how the Blackheart will line up any better if the collectors are crooked. Wouldn't it be better to slice the header and weld a wedge in? Are they uneven front to back as well? Can't tell from the pic...

 

[CDUNIGAN1981]

I don't see how the Blackheart will line up any better if the collectors are crooked. Wouldn't it be better to slice the header and weld a wedge in? Are they uneven front to back as well? Can't tell from the pic...

Having regrets about coating them so soon. Hate the thought of cutting on them but...

 

[fleming442]

It sucks that they got like . I'd be pi$$ed!!