69 Firebird
77 Trans Am
54 Pickup
52 Chieftain
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Restoration : Exhaust
  • Hedman 4-tube ceramic coated headers w/ ball collectors
  • Flowmaster American Thunder Exhaust System
    • 2.5" Dual Tube w/ H-pipe
    • Flowmaster Deltaflow-40 Series mufflers
    • All mandrel-bent tubing
    • Custom fit
    • Completely welded
    • Painted with 1200 degree high-temp aluminum paint
I purchased my Flowmaster 17139 Kit from Summit Racing. The kit contained 2.5" mandrel bent pipes, Flowmaster DeltaFlow 40 mufflers, and all necessary hanging hardware. After test-fitting the system under the car; I tack welded it, removed it, and then completely welded it. Finally, I painted it with high-temp paint.
I bought new Hedman #35276 4-tube ceramic coated headers from Summit Racing. They fit perfectly with no modifications and ample clearance everywhere. These headers came with the newer "ball-and-socket" style collectors. I also had to purchase 2.5" ball-and-socket style inlet pipes for the existing Flowmaster system.
I did a lot of work getting the new 2.5" ball-and-socket inlet pipes to fit around the transmission crossmember and then mate to the existing Flowmaster system. The new inlet pipes were originally 4" offset S-bends which I modified to about 1.5" offset. Finally, I shortened the 45° transition pipe and fit them all together.
This picture shows the clearance of the new exhaust system. Not bad for my first exhaust system build if I have to say so myself. The pipes are only about 1/2" below the subframe near the transmission crossmember, and fully tucked into the floorpans the rest of the way back.
I really like the look of the polished exhaust tips on the Flowmaster system. The angled cut on the end of the tail pipes flows very well with the receeding body lines below the rear bumper. They are visible enough to be noticed, but at the same time they don't stand out like a sore thumb.