3" down pips for Shorty headers

Hi, Looking to redo my exhaust system. Bought the shorty header and looking to install 2.5" system with long case muffler for my '71 455 GS. Question is, can is use the 3" down pipe and use a reducer to connect the 2.5 system? Not looking to go 3" all the way back. If so, what would the correct reducer size? Trying to make the install as easy ( more me ) as possible. Thanks.

 

So this would would go over the 3" down pipe and in the 2.5 system? Would the 3" down pipe have a larger diameter outer ?

 

Thank you.

 

If you can manage, it's better to keep the large diameter pipe until the muffler, then you can downsize coming out of the muffler. With a good muffler like the Walker DynoMax, the exhaust will think it's hit open air when it enters the muffler, then as the pulses mix, cool somewhat, and pass through the muffler, a 2.5 inch pipe won't be a restriction. As Per David Vizard - I built the 2NABOT exhaust that way (shorty headers, 3" pipe to the mufflers, then 2.5 inch over the axle and under the bumper), and it's as zero-restriction as a full length exhause can be.

 

Thanks, Never thought about going that way. Plan on getting the piping form TA as there are no muffler shops here that can do mandrel bends.
Hoping to do all the work myself and avoid any welding if possible. I was looking at the Walker but feel the maybe a bit to quite for me. Looking to go
FlowMaster 50 series long case. I have the old 40 series that was done back in the late '80.
Wonder if TA would split them up like you say???

 

Yes Larry, I have read up on these items. My Post is about the Shorty 3" down pips....

TA has Collectors reducers... Your first post is what i was looking for.

I bought the shorty used, so the collectors where modified for the previous owners exhaust.

 

Well, tried to order the TA 3" down pipe to connect to my shorty today and was told they are back order for the last 3 months. Does not sound good. I was placed on a list and will get a call when they come in.....Right.

 

I called last week and was told they are still on back order….

 

If this is the TA2008C you guys are looking for I was unaware that we were out. I see there are 3 sets on back order with us. To be perfectly honest. They are not even on order. I apologize. I will get these on order this coming Monday. Very sorry.

 

Well that just sad.....

 

Thanks for the heads up. What do you suspect the wait time will be ?

 

I tried to order some three weeks ago. Still on back order.

 

On back order for over a year. Don't hold your breath.