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2000-2005 Discuss your 2000-2005 Bonneville SE, SLE, and SSEi Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 02-17-2009, 01:28 PM   #11
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Purple,
Thanks, you're car looks just like mine.
Two more questions if you don't mind.
If you change the pully size on the supercharger, do you have to change the belt, or is there a tensioner that takes up the slack. If you have to change the belt, how do you know what size to buy, since it will no longer be the stock size?
The catalytic converter that you recommended - is that the one installed on your car? If so, are there no issues with codes?
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Old 02-17-2009, 01:28 PM   #12
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It'* a shame you don't come up here anymore. Would be nice to sit back and have a beer or two.
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Old 02-17-2009, 01:35 PM   #13
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I suggest a pulley size no smaller then 3.5" With that you do not need to change the belt size. If you went smaller then a 3.4" you would need to change it. Stock should be a 6 rib 725, you can go smaller if you want but it'* not needed. For that you can install a GB6-715
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Old 02-17-2009, 02:25 PM   #14
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Wouldn't a you want to do the dp too if the cat is coming off?
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Old 02-17-2009, 02:26 PM   #15
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Quote:
Originally Posted by hal brodmann View Post
Purple,
Thanks, you're car looks just like mine.
Two more questions if you don't mind.
If you change the pully size on the supercharger, do you have to change the belt, or is there a tensioner that takes up the slack. If you have to change the belt, how do you know what size to buy, since it will no longer be the stock size?
The catalytic converter that you recommended - is that the one installed on your car? If so, are there no issues with codes?
Hal - What Dan said answers your question perfectly about the SC pulley. Also, when you decrease the pulley size and go to a shorter belt, you will need to increase the idler pulley diameter. I'm not sure what the break out from pulley size to idler pulley increase is. But, Dan would be the one to chime in on that.

I'm running a 3.5 pulley and a Gatorback belt. No problems here.

The cat I mentioned is the one I'm running on my car. I have a 3" down pipe to the cat, no resonator, 3" to a Y pipe, and then split the exhaust out to Magnaflow 14324 and kept the stock tips. I went to this cat because it has no history of throwing codes out.
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Old 02-17-2009, 02:34 PM   #16
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How does your car sound with that arrangement?
Was the y-pipe fabbed up or is it the stock y?
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Old 02-17-2009, 02:35 PM   #17
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I'll answer both questions here.

No need to change the down pipe if changing the cat. There is a flange between the DP and the cat. Cut the pipe between that flange and the cat and weld new cat in. Unless you want a larger DP, the inside of a stock DP is about 2", can't remember exactly. I could messure it, I have one in the garage.

As for the over sized tensioner. This is fine with a stock belt size down to a 3.4" pulley. But no smaller. Here is what you get with a stock belt and a over sized tensioner with a 3.3" pulley
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This is a stock belt with stock tensioner
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The problem here is no belt tension so it slips.

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Old 02-17-2009, 05:02 PM   #18
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Quote:
Originally Posted by Y2KSTARSHIP View Post
How does your car sound with that arrangement?
Was the y-pipe fabbed up or is it the stock y?
The car sounds throaty with a deep resonance under light load. The Y pipe was fabricated. I have one helluva custom exhaust guy in town.
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Old 02-17-2009, 05:11 PM   #19
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Grape - Oops!, I mean Purple,
I don't want to beat this topic to death, but..........
What would the benefits be for the following scenarios:
Replacing my stock CAT with a Goerlich 608227 in the same size as the stock one.
Replacing my stock CAT with a 3" DP and 3" Goerlich cat and stock exhaust.
Replacing the entire exhause like you have done.
What are the benefits in MPG? In performance?
I appreciate your patience with me on this.
Money is tight, but I don't want to spend the outrageous price for an OEM converter if I can buy an aftermarket cheaper that provides better flow also. Also, what is the life expectancy of the aftermarket converter.
Thanks for all of the info. I greatly appreciate your advice.
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Old 02-17-2009, 05:17 PM   #20
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I was looking at your album and the exhaust work is incredible. Nice stuff.
I'd like to replicate it on mine. I'd really like to find someone who works with Stainless, but nothing yet.
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