[bus15241]

I have standard 67 gto with base 335 hp engine with stock manifolds. I am considering buying a 2.5" Flowmaster American Thunder exhaust system. Specs say install on headers on back. What do I need to do to attach to my stock manifolds. Car is automatic and has stock 2" pipes.

[This message has been edited by bus15241 (edited 10-22-2001).]

[bus15241]

I have standard 67 gto with base 335 hp engine with stock manifolds. I am considering buying a 2.5" Flowmaster American Thunder exhaust system. Specs say install on headers on back. What do I need to do to attach to my stock manifolds. Car is automatic and has stock 2" pipes.

[This message has been edited by bus15241 (edited 10-22-2001).]

[Dave A]

I would strongly consider getting an exhaust system that is designed to mate to the stock manifolds. The other choice is to get a set of headers.

The only other alternative I can think of involves having someone custom bend manifold pipes to meet up at the header junction on the flowmaster system, which would be a royal pain and hard to find a shop that would do that.

Since there are bolt in, manifold to tailpipe systems available, going with one of these is your best bet.

[bus15241]

Any good exhaust system suggestions to match up with my factory manifolds?

[Half-Inch Stud]

Do like I did.

Check for local shops that will mandrel-bend Aluminized pipe. Have the fella make the headpipes from 2.5" aluminized pipe.

Have the headpipes welded to the muffler inlets if you like.

Cost-effective and will last very long rust-free.

[Dave A]

All the exhausts I have ever had have been custom bent by an exhaust shop to fit, usually around 300 bucks for aluminized, which is a tad more expensive than ordering a kit, but better quality than the cheaper kits and it will fit better. Make sure you specify very specifically that you want 2.5" pipe.

I unfortunately do not have experience to recommend a do it yourself kit, other than noting seeing them in resto catalogues and speed shop catalogues.

[Sixties Guy]

Try Torque Technologies in Georgia. They have headpipes to fit HO manifolds and custom fit 2.5 and 3 inch exhaust systems. Mandrel bent and aluminized. They may have headpipes for standard manifolds as well.