Mike65 475 Report post Posted April 13, 2021 Hedman does not make a H pipe for the 88408 headers just 17" long extensions. Should I get the extensions & then have an exhaust shop make a h pipe to connect to the rest mid pipes, or have the exhaust shop make the pipe from the headers to the mid pipes?. I was also thinking of buying the H pipe from JBA for their 302 shorty headers w/T-5 trans & seeing if it would fit, or modify a stock h pipe?. Ideas, suggestions?. https://pertronixbrands.com/products/jba-performance-exhaust-1651sh-2-5-stainless-steel-mid-pipe-h-pipe-for-1650-289-302-t-5-transmission?variant=31797095366692 Quote Share this post Link to post Share on other sites
1969_Mach1 333 Report post Posted April 13, 2021 If you can easily get the car to a muffler shop, then have them connect your existing exhaust to the new headers. Also, consider installed an X-pipe in stead of the H-pipe. I wouldn't think the JBA H-pipe will bolt to your Hedman headers. Quote Share this post Link to post Share on other sites
Mike65 475 Report post Posted April 14, 2021 Why an X pipe instead of a H pipe?. Quote Share this post Link to post Share on other sites
1969_Mach1 333 Report post Posted April 16, 2021 It was originally thought the X-pipe would produce more hp. Some testing shows that the difference is small. I run an X-pipe and I will say the exhaust note is much different. Especially at idle the exhaust note is more mellow. If you have some type of performance cam it will sound more mild at idle with an X-pipe as opposed to an H-pipe. When X-pipes were first introduced the theory was the tubing for the X section should be the next size larger than the rest of the exhaust. I.E. 2-1/2" diameter exhaust would have a 3" diameter X. That's how mine is set up but I don't that that theory holds true today. Straight Exhaust vs. H Pipe vs. X Pipe! Engine Masters Ep. 22 - Bing video Quote Share this post Link to post Share on other sites
Vicfreg 771 Report post Posted April 27, 2021 Mike, I got a kit from Pypes that was a 2-1/2" header back system with an x-pipe with no mufflers. Mike (Latoracing) from the forum fabricated the exhaust using some Magnaflow mufflers I wanted to use. So, the X-Pipe is already prefabricated. We had plenty of pipe to get it done all the way to going out though the valence, which is a '66 GT trick, but looks cool. Credit to Mike for the artwork that is now my exhaust system. Incredible. Pypes kit is # SFM03 designed for our generation Mustangs. Quote Share this post Link to post Share on other sites
Mike65 475 Report post Posted August 28, 2022 Vic I know this is an old thread but I finally got the garage set up & I am ready to get back to work on the Mustang looking at your pics you stated you used a 2 1/2" header back system from Pypes. I have a system I purchased to put on the Mustang that includes tail pipes, turbo mufflers, & intermediate pipes, I just need an h pipe. Quote Share this post Link to post Share on other sites
Vicfreg 771 Report post Posted August 28, 2022 Hey Mike. Garage looks great! I used an X-Pipe from Pypes kit # SFM03. It was a 2-1/2" Cat Back SS kit. You can probably have your muffler shop make a H-Pipe. I think I did this because I have a C-6, and with the Convertible support plate in that area, the X-Pipe had the best footprint. The "old school" way of finding the right spot for the H-Pipe used to be to use some cheap spray paint on the pipe section just downstream of the headers, then run the car for like 10 minutes. Where the paint burns off, that is where you locate the cross over pipe. I also think you can use some type of steel marking crayon, and see where it melts...... Quote Share this post Link to post Share on other sites
Rsanter 152 Report post Posted August 31, 2022 X pipe is better this is what I made for my car 2 RPM and Mach1 Driver reacted to this Quote Share this post Link to post Share on other sites
