2.5" Exhaust Downpipe?

[ljeff20]

Middle of a TII swap on my '85 Daytona. Since the '85 came with 2.25" exhaust and the TIIs were 2.5", do I need to find a 2.5" downpipe for the conversion? Didn't see it mentioned in any of the write-ups on the subject, so a bit confused.

Thanks.

[superskasteve]

if you are not using the TI turbo and you bought a T II turbo from 89-90 you might need to use a 2.5 downpipe

[ljeff20]

That's what I thought. I got all the TII parts from a donor vehicle, so will start looking for a downpipe. Thanks.

[d_snook6]

What year is the t2? Anything 88 and up use a wider flange on the downpipe not sure but maybe you could inlarge the holes and use washers.

[detobias]

the '86-8 "TII" all used a 2.25" SV & DP ;
the '89 TII Only (there was no '90 TII) used the 2.5" SV & DP

all 89+ TI/TIII/IV used a 2.5" DP ..

[ljeff20]

Quote:

Originally Posted by detobias the '86-8 "TII" all used a 2.25" SV & DP ; the '89 TII Only (there was no '90 TII) used the 2.5" SV & DP all 89+ TI/TIII/IV used a 2.5" DP ..

Mine came from an '88 Daytona Shelby Z. So, the 2.25" I already have should work?

[detobias]

yes but you will need to enlarge the bolt holes quite a bit on the downpipe flange to accommodate the "wide flange" SV ('88-up)

get the die grinder out :)

[The Pope]

having a wide 88 flange SV I would consider the 2.5" exhaust, makes a ton of difference on the older cars with little exhaust.