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  #16 (permalink)  
Old 04-30-2003, 02:41 PM
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hey slider, hows that exhaust turning out?

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  #17 (permalink)  
Old 04-30-2003, 05:05 PM
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Not yet, but it is on the list. Gotta flip the rear end, put 3" drop spindles in the front. Loose the "SERVIS" bed on it, install a 40 gal gas tank between the frame rails, and loose the saddle tanks. Considering a "Gear vendors" overdrive unit. Right now i`m trying to learn a little bit about body work. I really want to do everything i can on this one myself.
Hea , thanks for asking.
Slider in Wa.
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  #18 (permalink)  
Old 04-30-2003, 05:36 PM
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Why don't you get whatever mufflers you want and then run dump tubes? Thats what I do...its fun to switch it up every once in a while.
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Old 04-30-2003, 06:05 PM
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1BAD80 posted a link to an article written by the Hands who are excellent Pontiac people. I just wanted to add that they also put out a CD of exhaust sounds which consists of something like 54 soundtracks of different exhausts and mufflers both with an X-Pipe and without attached to a 455 Pontiac engine revving at different RPM's. The CD used to also come with a spread sheet showing decibal levels and flow numbers. If anyone is interested in buying the CD, here's a link.

<a href="http://shop.sslonline.com/cgi-sz4/webc/sz41/accounts/a0004287/st_prod.html?p_prodid=199&p_catid=1&sid=8jw30t0lg2 Ui8Of-41103271249.96" target="_blank">Silent Power CD</a>

[ May 01, 2003: Message edited by: 6567GTO ]</p>
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  #20 (permalink)  
Old 05-01-2003, 04:45 PM
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One of those articles said that a 250-300 horse engine should have like 3in. exhaust....So, what IS the deal with back pressure. I've heard alot that 2.5in. would be plenty for the 400+hp 355 that i plan on building....what's the deal?
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  #21 (permalink)  
Old 05-02-2003, 06:19 AM
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Adrenaline - are you talking about the link 1bad80 supplied because I couldn't find that written anywhere. That doesn't sound right at all.
2.5" IS plenty for what you're building. You might want to add a crossover pipe. (X or H)
You cam also run 3" primaries up to the mufflers and then run 2.5" tail pipes without any restriction.
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  #22 (permalink)  
Old 05-02-2003, 05:29 PM
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man, I read an attachment from someone here about exhaust and some very good info is there but am not sure how to do this, so I will try anyway....

www.boylesworks.com/ta400/psp/exhaust.html

this is quite enlightening
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  #23 (permalink)  
Old 05-02-2003, 05:32 PM
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jeez, see, it won't work! anyway that is the web address.......

good luck slider, sounds like you have your work cut out for you doing body work <img src="graemlins/crash.gif" border="0" alt="[crash]" />
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Old 05-02-2003, 09:39 PM
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Is it possible to put an X or H crossover in a dual cat system? Doesn't that confuse the HO2 sensors as there's one for each bank??
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  #25 (permalink)  
Old 05-03-2003, 01:56 PM
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Bluesman, yes it's possible to use an X pipe with dual cats. Here's a pic of one from DrGas which is where I bought my X-pipe. The sensors are on the front pipe before the X so they aren't affected.

<a href="http://www.drgas.com/photos.html" target="_blank">X-pipe with dual cats - click here</a>

Go to misc. pictures and click on #6.

[ May 03, 2003: Message edited by: 6567GTO ]</p>
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  #26 (permalink)  
Old 05-08-2003, 06:07 PM
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Nice link, 6567! What difference did your X-pipe make in the sound?
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Old 05-08-2003, 07:50 PM
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here is a site with exaust sounds check it out

www.exhaustsoundclips.com
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  #28 (permalink)  
Old 05-09-2003, 04:20 AM
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Bluesman - I actually installed the system on the car at the same time as the motor so I can't compare it. But, it sounds great at idle (nice and aggressive) and quiets down a little throughout the midrange (no resonance in the interior) and has a kind of a raspy Indy car sound at the tail pipes at high revs. Kinda hard to explain, but I like it.
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  #29 (permalink)  
Old 05-14-2003, 03:03 PM
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6567GTO, how do you like the performance of those x pipes?
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  #30 (permalink)  
Old 05-14-2003, 04:52 PM
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Adrenaline_Fiend is refering to the site from Steve 5.0 Towncar (good site Steve)http://www.nsxprime.com/FAQ/Miscella...austtheory.htm

[ May 14, 2003: Message edited by: 1BAD80 ]</p>
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