Headers and the like.

Hjulen · Post by **Hjulen** » Tue Feb 28, 2006 6:06 pm

Anyone have experience with the headers available from VICKs or IAP? and of course the legendary Python headers that Mark makes....

I am trying to imagine what kind of improvement is would have over the later type 4-2-1 exhaust. Part of me thinks an improved exhaust system would be essential to a well rounded system, but another part believes in cost versus benefit.

vcg · Post by **vcg** » Sun Mar 26, 2006 1:09 pm

A friend bought an IAP 4-2-1. Well made and tuned but good for 90-120HP to my opinion. For over 120HP applications I suggest custom 4-1 header with 66cm long primaries with 42 or 44 mm outside diameter.

spiderrey · Post by **spiderrey** » Sun Mar 26, 2006 1:21 pm

i have a set of marks headers. actully on his website, his headers are pictured on my engine before it was completed. i am very happy with them, but cant really tell u exactly how much of a difference they made. because i went from a bone stock 1438. yanked it out and dropped in a fully built 2 liter with his headers and many other mods. there was some one on this site who had a comparion of before and after. he seemed to be very happy.then mark came out with a new set that would work better on smaller motors.

fiatguy85 · Post by **fiatguy85** » Thu Apr 27, 2006 11:30 am

[quote=vcg]A friend bought an IAP 4-2-1. Well made and tuned but good for 90-120HP to my opinion. For over 120HP applications I suggest custom 4-1 header with 66cm long primaries with 42 or 44 mm outside diameter.[/quote]

What is your source of the numbers...testing or calculation?

vcg · Post by **vcg** » Sat Apr 29, 2006 12:36 pm

Neither testing, nor calculation... Just direct copy of the 1973-4 124 Rally Abarth specs. Alquatti of Cremona made that stuff in the 80s as well commercially, and PBS suggests the same in their current pages. Why do you ask?

fiatguy85 · Post by **fiatguy85** » Sun Apr 30, 2006 12:05 pm

I'm building my own header, for a turbo.