Exhaust Mods? Stop Here! - Page 4 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Performance, Brainstorming & Tuning Talk about modifications, or anything else associated with performance enhancements. Have a new idea for performance/reliability? Post it here. No idea is stupid! (please use Detailing and Appearance for cosmetic ideas)

Closed Thread
 
 
 
Thread Tools Search this Thread
Old 04-18-2004, 01:01 AM   #31
Senior Member
Certified Car Nut
 
Join Date: Jun 2003
Posts: 15,928
Thanks: 0
Thanked 0 Times in 0 Posts
BonneMeMN is on a distinguished road
Default

You'll loose some Torque, but you'll gain HP. It basically balances out the power curve. I've driven SSEi95'* car, with his pulley, colder plugs, stock airbox (i know) and 3" exhaust to magnaflow. It wasn't missing anything on the bottom end IMO

Get a 3", and fill it with a small pulley, and good CAI and you're good.
BonneMeMN is offline  
Old 04-18-2004, 01:03 AM   #32
Sol
Senior Member
True Car Nut
 
Join Date: Sep 2002
Posts: 8,909
Thanks: 0
Thanked 0 Times in 0 Posts
Sol is on a distinguished road
Default

Ya, I don't know if it works with a Bonneville, but there is a 3" RT downpipe and cat that would go well with some nice headers. The only problem is, headers are incredibly expensive. Porting the headers would be nice, giving a significant gain, but it will still have the 2.5" size. Going to 3" would be nice for the overall effect of modifying the car, but it would cost a ton.
Sol is offline  
Old 04-18-2004, 01:07 AM   #33
Senior Member
Certified Car Nut
 
Join Date: Jun 2003
Posts: 15,928
Thanks: 0
Thanked 0 Times in 0 Posts
BonneMeMN is on a distinguished road
Default

Quote:
Originally Posted by Sol
Ya, I don't know if it works with a Bonneville, but there is a 3" RT downpipe and cat that would go well with some nice headers. The only problem is, headers are incredibly expensive. Porting the headers would be nice, giving a significant gain, but it will still have the 2.5" size. Going to 3" would be nice for the overall effect of modifying the car, but it would cost a ton.
Bonnies don't have a U bend, so they don't have any to gain really.

Actually, MNCGP had a deal at their last meet/mod day for downpipes, and it'* MUCH cheaper with an exhaust shop doing it.
BonneMeMN is offline  
Old 04-18-2004, 01:09 AM   #34
Sol
Senior Member
True Car Nut
 
Join Date: Sep 2002
Posts: 8,909
Thanks: 0
Thanked 0 Times in 0 Posts
Sol is on a distinguished road
Default

I just chose an example. But for an L67, I think 3" is the way to go.
Sol is offline  
Old 04-18-2004, 01:11 AM   #35
Senior Member
Certified Car Nut
 
Join Date: Jun 2003
Posts: 15,928
Thanks: 0
Thanked 0 Times in 0 Posts
BonneMeMN is on a distinguished road
Default

I think a common misconception on these boards is that we can't open things up. Frankly ALL engines benefit from better breathing. Whether you like the effect personally or not is your own decision.

There'* no reason our 3800 doesn't do this either. Yes you need some backpressure. But 3" with a high flow cat, and some muffler will most likely work for anyone.
BonneMeMN is offline  
Old 04-18-2004, 01:28 AM   #36
Junior Member
 
Join Date: Jun 2002
Posts: 0
Thanks: 0
Thanked 0 Times in 0 Posts
2000SilverBullet is on a distinguished road
Default

My headers made a huge difference.
Well worth the cost of a set of new tires.
I laid a twin patch of rubber today all the way thru 1st gear with almost a full load of passengers...................I really do need a set of new tires.
2000SilverBullet is offline  
Old 04-18-2004, 01:29 AM   #37
Sol
Senior Member
True Car Nut
 
Join Date: Sep 2002
Posts: 8,909
Thanks: 0
Thanked 0 Times in 0 Posts
Sol is on a distinguished road
Default

I would love to get a set of TOGs when I get my GTP. It seems like a lot of people are very very successful with them.
Sol is offline  
Old 04-18-2004, 01:38 PM   #38
Junior Member
Posts like a Ricer Type-R
 
Join Date: Aug 2002
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
willwren is on a distinguished road
Default

Keep in mind that we've had SC and NA cars try to go 3" in the past, and they lost low-end torque. In one case, they scrapped it and went back to 2.5". You have to have a ton of mods to support 3" exhaust and keep the low end. 2ksb can do it, and our better modded SC'd cars like his. I would even doubt my own car with 3" exhaust. I don't have enough flow to support it.
willwren is offline  
Old 04-18-2004, 06:56 PM   #39
Senior Member
Certified Car Nut
 
Join Date: Jun 2003
Posts: 15,928
Thanks: 0
Thanked 0 Times in 0 Posts
BonneMeMN is on a distinguished road
Default

Quote:
Originally Posted by willwren
Keep in mind that we've had SC and NA cars try to go 3" in the past, and they lost low-end torque. In one case, they scrapped it and went back to 2.5". You have to have a ton of mods to support 3" exhaust and keep the low end. 2ksb can do it, and our better modded SC'd cars like his. I would even doubt my own car with 3" exhaust. I don't have enough flow to support it.
I've driven SSEi95'* car. It wasn't missing anything He still had plenty more then I do now. That'* with a pulley, STOCK airbox, so it'* basically being choked on the front end.

it all depends on what you're after
BonneMeMN is offline  
Old 04-19-2004, 06:44 AM   #40
Senior Member
Posts like a Camaro
 
Join Date: Apr 2004
Location: Land of Lincoln
Posts: 1,107
Thanked 5 Times in 4 Posts
scottydl is on a distinguished road
Default

Quote:
Originally Posted by willwren
So comparing just the more popular (here in Bonneville Land) 2 mufflers, Flowmaster and Magnaflow, The Magnaflow is 1% more hp (3.5 hp over Flowmaster), 0.2% better in torque (basically the same), 14% better in flow, and virtually the same sound, except for a 1db quieter level at WOT.

It doesn't sound like much, but it is an edge. There are alot of people that won't laugh at a 3.5 hp difference.
What kind of hp would these mufflers add to the stock 225hp for the 3800-II? (I about choked when I was looked at the ~370hp levels in the post, but then I realized that was for a Mustang 5.0!)
scottydl is offline  
 
 
Closed Thread

Related Topics
Thread Thread Starter Forum Replies Last Post
Stop it Stop it Stop it.......... BLACK94SSEi Lounge 6 09-09-2006 03:14 PM
What's are your mods or future mods on your Bonne? Str8pimpin Performance, Brainstorming & Tuning 20 09-15-2004 12:16 PM
STOP HERE...The Toronto AutoShow pics are now READY! Jim W Lounge 19 02-16-2004 08:06 PM
Tell us about your exhaust mods brminder Performance, Brainstorming & Tuning 21 08-30-2002 10:18 AM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 03:21 PM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.