Mohr performance header
andrewlandon67:
Quote from: Sarge on March 11, 2022, 20:54:49 pm
I had my changes made in 2013 when I got rid of the sidewinder system I'd been running. I made no jetting changes and the wake-up call seems more in the low-end. My motor is pretty much old school... a 125 Engle cam and some Fumio cylinder heads with 40mm int X 35mm exh valves and 9.0:1compression. The 3" sections were fabed up by Tiger at A1.
I recently ran across a picture of Bill Schwimmer's engine while it was out of the car a while back and noticed he runs a stepped header as well but probably larger diameter (bigger engine). Sometimes, ya just gotta try stuff.... ;D
I know how that goes for sure! I'm hoping to try a set of the Berg grooved venturies in my IDFs this summer, possibly in conjunction with a larger header, which might be fun. My main question is what brought you to the 3" length though? What I've been able to find about stepped headers online seems to show that how far down the "step" is is usually tied to some other metric on the engine.
Sarge:
Ha... that's top secret!! ;) Maybe it's tied to some part of my anatomy... All kidding aside, I never gave it much thought other then that I wanted to create some back-pressure. Tiger did the rest.
andrewlandon67:
I suppose that makes sense! This post has me thinking about ways to cheaply/easily create a stepped header similar to what you run, as I like the low end of the 1 1/2 on my 1915 but I can't help thinking there might be some more up top to unlock with more diameter.
baz:
The guy who tells me the primaries are too long in the mohr header suggested a better way is to build your own system. He gave me a sketch of how to build something that performs as well almost as a stinger but super quiet.
Interesting topic for sure, I bet a lot of us are leaving some performance behind due to less than ideal exhaust systems
andrewlandon67:
Quote from: baz on March 12, 2022, 17:10:03 pm
The guy who tells me the primaries are too long in the mohr header suggested a better way is to build your own system. He gave me a sketch of how to build something that performs as well almost as a stinger but super quiet.
Interesting topic for sure, I bet a lot of us are leaving some performance behind due to less than ideal exhaust systems
That absolutely wouldn't surprise me, but given the general attitude of the VW scene (one part has to fit everything AND be super cheap) I'm guessing it's just easier to find a version of something that just works and then market it. Bespoke is expensive, and not everyone has the space/tools/time to devote to becoming an exhaust builder for just their own car. It's a shame too that the VW performance scene was written off by the V-8 companies ages ago, you can dial in every aspect of your Chevy-engined racecar on a number of websites and it'll spit out the exact primary length, diameter, number of steps, and even bend configuration to get the performance you want, and they'll fabricate a pair of headers to those specs and ship them to your door. It really seems that we traded the convenience of ordering a header that we think will work alright size-wise, but we know will fit the same, for the ability to actually have what we need when we got into VWs.
Unless, of course, you actually live in southern California and can just pop over to A-1, but that's not a commitment I'm really willing to make just for an exhaust. It's good that we're getting some of these conversations rolling though, it'd be nice to see some of this come to fruition eventually.
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