[ajax]

what do you guys with performance motors do for tailpipes? the stock single tailpipe replacement is only 2 inches at the joint and 2 1/2 at the exit, but if your running 2 1/2 exhaust from the manifold back how would you join up to a stock looking tailpipe and have it flow right?

[Rocky Rotella]

Ajax, it's so far back in the system and the volume/heat of the exhaust gas has been reduced do significantly by that point, that it's not seen as a restriction by the engine.

Keep in mind that '74 and '75 do not share tailpipe extensions. '74's are a longer version of the '71-73 style where as '75 is its own. While it looks similar, it's contoured differently and is welded to the pipe unlike '70-74, which are a slip-fit design retained with a clamp.

[ajax]

Originally Posted by Rocky Rotella

Ajax, it's so far back in the system and the volume/heat of the exhaust gas has been reduced do significantly by that point, that it's not seen as a restriction by the engine.

Keep in mind that '74 and '75 do not share tailpipe extensions. '74's are a longer version of the '71-73 style where as '75 is its own. While it looks similar, it's contoured differently and is welded to the pipe unlike '70-74, which are a slip-fit design retained with a clamp.

thanks rocky, but i thought the tailpipe was the same for 74 and 75 except where a 455 version of the 75 there is a splitter pipe as the 76 to 81 version is!? usually in cataloges the 74 to 75 tailpipe is the same?

[form74]

Performance years sells a repro tailpipe 2 1/2 inch for 74's. That is what I used on my exhaust.

[Rocky Rotella]

ajax, from certain angles the '74 and '75 (non-455 cars) tailpipe extensions look identical, but you can see in these photos by John Glasgo of an extremely low-mile '75 Trans Am he once owned, the pipes are shaped differently. They have a bit of a kink in them that allows them to follow the shape/contour of the quarter panel.

I know many places market the '74-75 tailpipe as the same, but the extensions are definitely unique to each year. As you noted, the 455 cars were equipped with splitters in '75.

Hope that helps!

[bluebird455]

That's what I've always thought, but could not confirmed till now. Thanks for the info.