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concern is most likely wont fit as is in the Fiat, the front A-arms are mounted really close to the block and I think that the upper A-arm tabs and the headers want to occupy the same location, and this is with the front suspension 4" forward from where it would normally be.
Anyone on here have a set? Mounted? that you can post some pics and maybe take some measurements. or anyone have a 3D scan of a set?
Without CAD of the actual header, or a few more dims, cant make a determination. however Speed Engineering gave me one dimension, just not the remainder I asked for.
if I ASSUME that the furthest point is 4" out from the flange and that is the collector, I may be able to lower the motor a bit and get the header to just come under the upper A-arm mount.
but that puts me into really shallow oil pan territory. I cant move the motor more than another 1/2" forward or aft because I run into the rack in the front and the firewall behind the motor.
Its close enough it may be worthwhile to buy a set and scan them. going to take the pics and approximate some dimensions to make a model over lunch sometime.
So maybe not for you but because I'm cheap I built a couple of sets of headers. Bought the LS exhaust flanges and a header build kit from Summit. Fitted and then tacked welded them together. Then took them to a local welder to tig them. Yeah it was time consuming but kind of fun.
So maybe not for you but because I'm cheap I built a couple of sets of headers. Bought the LS exhaust flanges and a header build kit from Summit. Fitted and then tacked welded them together. Then took them to a local welder to tig them. Yeah it was time consuming but kind of fun.
I normally have to build everything because there are no catalog bits that ever fit the combinations I put together. Normally I tack them fully, then make a fixture to allow TIG welding or gas welding as needed.
By everything, everything from oil pan to pickup to headers to accessory drives to custom water pump housings to custom chassis, to suspension to flywheels.
building headers is OK, however the materials to build headers is cheaper if you get the bends from a sanitary tube supplier than a "exhaust" supplier But with a COTS solution of about $220 almost ready to go, its hard to pass up not investigating further
I took the pictures from Speed Engineering along with some of the conversations and approximating some of the dimensions on the images..... and made some assumptions. i then modeled the header on the left side. (right side coming soon)
with moving the motor aft 1/2" (requiring relocating some of the items inside the cabin, I can nearly clear everything with just about 3mm of clearance of the stock corvette upper a-arm. Really tight, however will allow me to get them and do a slight tweak to the flange to tube joint to get them to fit.
You need a set of rear Dump Shorty Headers like in my picture. The company that made these is no longer in business. They were advertised for a Camaro. You may have to make a set yourself with the tubes coming out of the head and going up and toward the fire wall and then dump down roughly in line with the rear exhaust port. Then you may have to relocate the coils and make up some plug wires. 10 pounds of S#!% in a 5 pound bag. I went through it with my car.
Last edited by Austin Phil; Nov 27, 2025 at 04:37 PM.
Reason: Add sentance
You need a set of rear Dump Shorty Headers like in my picture. The company that made these is no longer in business. They were advertised for a Camaro......... 10 pounds of S#!% in a 5 pound bag. I went through it with my car.
I need the dump to be middle of the motor. The recessed firewall is just behind the head and rear face of block. The footwell prevents dumping behind cylinders 5/6
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Speed Engineering Shorty swap headers 
