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Old 08-18-2004, 07:21 PM   #11
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Very nice Sol! That GTP'* coming along nicely. That DP and cat should be money well spent
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Old 08-18-2004, 07:33 PM   #12
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It'* just 4 bolts bud, you could do it in the driveway in 10 minutes if you knew the bolt sizes...

But a lift is nice!
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Old 08-18-2004, 07:39 PM   #13
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Quote:
Originally Posted by macho_mike21
how much for the cat and d-pipe?
$300 USD. The guy custom builds it to your specifications, and you get it in two weeks. I just told him it goes to a stock exhaust.

http://www.clubgp.com/newforum/tm.as...anguage=single

Too bad its only for Grand Prix'*.


Quote:
It'* just 4 bolts bud, you could do it in the driveway in 10 minutes if you knew the bolt sizes...

But a lift is nice!
It beats crawling under the car, thats for sure.
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Old 08-18-2004, 07:45 PM   #14
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Bonneville'* don't need the downpipe, they have a straight one from the factory. It'* why GP'* are rated lower in power.
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Old 08-18-2004, 09:38 PM   #15
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Quote:
Originally Posted by BonneMeMN
Bonneville'* don't need the downpipe, they have a straight one from the factory. It'* why GP'* are rated lower in power.


Bonnevilles have downpipes. It'* the pipe that goes from the rear manifold to the catalytic converter, there is also an integrated flex coupler at the manifold flange.

Cheers,
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Old 08-19-2004, 12:52 PM   #16
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we dont have the u-bend, thats why we have 5hp more.

You could do it with blocks probably if you wanted to.
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Old 08-19-2004, 03:50 PM   #17
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Quote:
Originally Posted by Foghorn
Quote:
Originally Posted by BonneMeMN
Bonneville'* don't need the downpipe, they have a straight one from the factory. It'* why GP'* are rated lower in power.


Bonnevilles have downpipes. It'* the pipe that goes from the rear manifold to the catalytic converter, there is also an integrated flex coupler at the manifold flange.

Cheers,
Yes but a larger one will gain anything, Sol'* car (GTP) has a U bend, so he'* getting rid of that.

You had a GP before
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Old 08-19-2004, 07:08 PM   #18
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Sol, for even better flow look at enlarging the Y-pipe if you ever switch out mufflers. I think that the Y pipe is only 2 inch diameter.
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Old 08-19-2004, 07:40 PM   #19
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I'm gonna leave the rest of the exhaust how it is. You really don't need to change it unless you are running 12'*. The downpipe/cat is installed now. I took it on the freeway to test it out. Everything runs a lot smoother now. It'* not a huge difference, but I can see the engine running a lot better at higher RPM'*.
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