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Engine - General, Exhaust & Induction Topics about the general engine items, exhaust system discussed here & Improving the intake tract - air filter to intake valve.

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Old 02-23-2013, 08:01 PM   #1
2.5" Exhaust Downpipe?  
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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.

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Old 02-23-2013, 09:23 PM   #2
Re: 2.5" Exhaust Downpipe?  
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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
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Old 02-23-2013, 09:35 PM   #3
Re: 2.5" Exhaust Downpipe?  
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That's what I thought. I got all the TII parts from a donor vehicle, so will start looking for a downpipe. Thanks.
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Old 02-24-2013, 07:40 AM   #4
Re: 2.5" Exhaust Downpipe?  
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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.
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Old 02-24-2013, 07:44 AM   #5
Re: 2.5" Exhaust Downpipe?  
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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 ..
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Old 02-24-2013, 12:32 PM   #6
Re: 2.5" Exhaust Downpipe?  
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Quote:
Originally Posted by detobias View Post
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?
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Old 02-24-2013, 04:09 PM   #7
Re: 2.5" Exhaust Downpipe?  
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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 :)
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Old 02-25-2013, 11:47 AM   #8
Re: 2.5" Exhaust Downpipe?  
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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.
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