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:3d_frown:WE HAVE ANOTHER PROBLEM:3d_frown: Most of you have heard of pulse firing. Here is a quick run down. This is what should happen, since we have a six cylinder. We have two collectors with three pipes in each going to one 3-2-1, known as a Tri Y design. Which makes the most overall...

I'm going to dig one of mine out. Maybe even get it flow tested at the shop. My memory of a stock manifold is not good. Would Extrude Honing do anything here?

The flange is 3/8" thick @ best. Yea looks like a header build tread coming for "Mythical"(that's what my friends call my car):biglaugh: Thanks for the link. Sounds like the OBX is much better made than the Pacesetter.

Hell yea, I plan on it. But for the guy who wants to modify his 7M it's good to know if you are going to out grow your latest mod really quick.

No worries, this is why we are sorting this out:icon_bigg. Looks like a Pacesetter header BARELY can handle a STOCK 7M head exhaust flow! Put a ported head on it and you just wasted time and money:3d_frown: It's just old tech guys the thinking behind this header is just dated. Tanya's Trust...

:3d_frown: WE HAVE A PROBLEM:3d_frown: I just measured the primaries on my Pacesetter. "Inside diameter" which is what we have been talking about is 1 3/8" not an 1 1/2"!!

Oh yea, that's Ed's old set up. Someone on here has that car. http://forums.performanceforums.com/forums/showthread.php?p=839439470#post839439470

Close:icon_bigg. For the DD 1 1/2 primary and 2.5 collector is what your looking for: Stock to mild build up.(intake, exhaust some ignition upgrades) Headers: Pacesetter, OBX, Doug Thorley 1 5/8 primary and a 3" collector: All of the above plus head work, cams, compression. Header...

Thanks man:icon_bigg People like you are the reason why I don't give up!

So you shortened your collector. From this stuff looks like you hurt yourself, I know the design sucks. I always thought two O2s might work better plumbed into the upper Y section.

How long should the collector pipe be? Well track or dyno time. Since most of us have to have cats. Lets stay legal the modified way:biglaugh: A good cat can act as a "pressure wave termination box" I'm using a small flow master. The length between the collector and the "pwtb" is your tune on...

Nice header! Wish it were bigger:3d_frown: http://www.dougthorleyheaders.com/products/sfID1/9/sfID2/35/sfID3/39/productID/935 Thanks man:icon_bigg So if we are going to use a Trust header the collector needs to be a 3" one.::hah:: Looks like all those N/A guys running 3" exhaust are on to...

Okay my math sucks tonight 1.75 x 1 5/8"...some place over 2.5"? Reason: "A good starting point for the collector/secondary pipe size of a simple 4-into-1 header is to multiple the primary diameter by 1.75. Fortunately, the collector can be changed relatively easily and it is often best...

This is why I asked: "As for the secondary length-that is from about the middle of the collector to the end of the secondary (or the first large change in cross-sectional area), we find a great deal more sensitivity than is seen with the primary. Ironically, few racers pay heed to collector...

Tanya how long is the section say an inch just pasted the "Y" where it's one pipe to the cat?

Thank you Tonya for the Trust header information. You have given us a great missing link. A great two into one collector would looks like a wonderfull adition to the Trust header. http://www.burnsstainless.com/MergeCollectors/2into1base/2into1base.html Now lets get the collector length...

That being the case then any 5/6M header 1 5/8" primary will cover the needs of 99.9% of the 7M world even me. The hard part is done, no pipe fabing (DARN:biglaugh:)

Yup, love those big valves. Plus the port design is a lot less anemic. I wouldn't be surprised.

Kool link, but we need simple stuff. http://www.supramania.com/forums/showthread.php?t=52&highlight=Flow+numbers Okay a stock 7M head flows 130ish cfm. Plug that in to the chart. A primary pipe of 1.375". My thinking a primary pipe of an 1.5" would cover most applications. I don't have...

These are flow numbers..Intake or exhaust? We need exhaust I'll dig my old numbers up.