3400 Downpipe question

Post information about exhaust systems. Either purchased or custom made
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themixer
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3400 Downpipe question

Postby themixer » Thu Jul 24, 2014 8:41 am

Found this information on a search

viewtopic.php?f=6&t=14487&p=112861&hilit=3400+downpipe#p112861


I assume the flange I need is for a 3100 Grand am from around the 1994 era just wanted to confirm this before ordering the part



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Re: 3400 Downpipe question

Postby 3X00-Modified » Thu Jul 24, 2014 10:05 am

all the way up to a 05 3400 would be the same flange IIRC...



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Re: 3400 Downpipe question

Postby themixer » Thu Jul 24, 2014 12:24 pm

anyway that its possible to check this? unsure if the flange is available as a part i may have to buy the entire downpipe



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Re: 3400 Downpipe question

Postby 3X00-Modified » Thu Jul 24, 2014 1:16 pm

Its not separate its one part.



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Re: 3400 Downpipe question

Postby themixer » Tue Jul 29, 2014 8:25 am

I just realized i saved the down pipe from the 3400 venture van any possible way of using this one?



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Re: 3400 Downpipe question

Postby 3X00-Modified » Tue Jul 29, 2014 9:40 am

cut the flange off and have a muffler shop weld a down pipe that fits to it.



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Re: 3400 Downpipe question

Postby themixer » Tue Jul 29, 2014 10:02 am

any worry about using a flex pipe?



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Re: 3400 Downpipe question

Postby 3X00-Modified » Tue Jul 29, 2014 10:15 am

longevity... they don't last long.



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Re: 3400 Downpipe question

Postby themixer » Tue Jul 29, 2014 12:31 pm

this is fantastic news, found some exhaust wrap also so will get that put on at the same time to protect my shifter cables



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Re: 3400 Downpipe question

Postby 1988GTU » Tue Jul 29, 2014 12:54 pm

depending the flex pipe used, it can last many years to many days. The thin corrugated tube often found at the local parts store is not going to last. That's meant for a temp "get me home without much attention/no tickets" fix. The use of a nice welded on inconel flex bellow on to non rusty (prefer new) pre existing exhaust will last a long time.


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Re: 3400 Downpipe question

Postby themixer » Thu Jul 31, 2014 7:57 am

well the van parts were not usable on the car, the exhaust shop fabricated the entire pipe and flange. Its attached to the car using a similar method to the original exhaust springs and donut gasket. They even wrapped the shifter cables wrapped in high heat foil, and the down pipe itself is wrapped all the way with header wrap.

$280 later the car is quiet now I can troubleshoot all the other problems !




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