Exhaust Headers '00 Bonneville - Page 3 - 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)

Reply
 
 
 
Thread Tools Search this Thread
Old 08-29-2011, 12:54 AM   #21
Senior Member
Posts like a 4 Banger
 
chris slee's Avatar
 
Join Date: Mar 2011
Location: clinton twp,mi
Posts: 133
Thanks: 0
Thanked 0 Times in 0 Posts
chris slee is on a distinguished road
Default

k thanks im going to order these and see what happens ill post picks soon and let u guys no how the install went
chris slee is offline   Reply With Quote
Old 08-31-2011, 08:34 AM   #22
Member
Posts like a V-Tak
Thread Starter
 
Join Date: Mar 2011
Location: St. Charles, MO
Posts: 53
Thanks: 0
Thanked 0 Times in 0 Posts
jedwards83 is on a distinguished road
Default

Anyone know which cat I'll need?

I've only seen mention of using a 3" (?) high flow cat, but the speed daddy headers says 2.5" outlet.

Anyone with experience know what inlet outlet diameter cat am I looking for to hook up to the headers and stock cat-back? Need to get this stuff ordered soon.
jedwards83 is offline   Reply With Quote
Old 09-06-2011, 04:18 PM   #23
Retired Senior Admin

Expert Gearhead
 
Danthurs's Avatar
 
Join Date: May 2006
Location: Sheboygan Wisconsin
Posts: 29,661
Thanks: 0
Thanked 16 Times in 13 Posts
Danthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to all
Default

Your stock cat should be a 2.5" You will only need a 3" if you use a 3" down pipe.
Danthurs is offline   Reply With Quote
Old 09-06-2011, 10:56 PM   #24
Member
Posts like a V-Tak
Thread Starter
 
Join Date: Mar 2011
Location: St. Charles, MO
Posts: 53
Thanks: 0
Thanked 0 Times in 0 Posts
jedwards83 is on a distinguished road
Default

Forgive my confusion... But don't the headers negate the need for a downpipe? Meaning whichever outlet the headers have connects straight to stock cat?

If I choose to buy a new hi-flow cat, what size do I need? 2.5" or 3"?
jedwards83 is offline   Reply With Quote
Old 09-06-2011, 11:03 PM   #25
Retired Senior Admin

Expert Gearhead
 
Danthurs's Avatar
 
Join Date: May 2006
Location: Sheboygan Wisconsin
Posts: 29,661
Thanks: 0
Thanked 16 Times in 13 Posts
Danthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to all
Default

The down pipe is what connects from the header to the cat. You can use a 3" cat, but it will need to be matched to the outlet of the header.
Danthurs is offline   Reply With Quote
Old 09-25-2011, 11:54 PM   #26
Member
Posts like a V-Tak
Thread Starter
 
Join Date: Mar 2011
Location: St. Charles, MO
Posts: 53
Thanks: 0
Thanked 0 Times in 0 Posts
jedwards83 is on a distinguished road
Default

Got the Speed Daddy headers installed this weekend. Process was pretty straightforward with the instructions in this thread. W body dipstick worked without any modification, I can see where the H body one would get in the way.

Two things I wish I'd known ahead of time:

a) pulling dipstick tube will leave about a quart of ATF on your driveway.

b) front header flange is a different shape than the stock flange. It'* shaped to fit the gasket, while the stock flange only has material around the ports, leaving parts of the gasket exposed to accumulate crud. I didn't notice this and proceeded to tighten down the header flange onto all that crud and wound up having to remove it again and clean the mating surfaces.

The whole thing is very time consuming as a lot of the existing exhaust fasteners will be thoroughly rusted, which makes you take your time and exercise a lot of patience-- Otherwise you risk stripping heads, and that will pretty much put an end to your project. While removing the crossover from the stock rear manifold, the bolts broke off inside the manifold.

As suggested, I had to get creative in getting the header downpipe to mate up to the existing exhaust. I had a new hi-flow spun cat to put on also. With the right combination of clamps, pipe and adapters, I had the thing together solid. It did require a saw-zall and angle grinder w/ cut-off wheel to cut the various pieces and stock exhaust to the right length.

What I ended up with was: Header DP -> 3" OD pipe -> 3" ID cat -> 3" OD pipe -> 3" ID to 2 1/2" OD reducer -> stock exhaust. I hadn't realized the stock exhaust was 2 1/2" ID, so I was able match it right up to the reducer without any kind of coupler.

The downpipe to 3" pipe clamp provided with the kit was tricky, and took three or four attempts to get the flanges to match up correctly. I cut out a gasket and used it between the flanges for good measure.

Here'* some pics when it was all said and done. The black on the exhaust is some high-temp RTV I used at the joints. More than likely it'll all burn off and turn to smoke, but it gave me a little piece of mind. I was quite surprised that I have the entire system leak free using only clamps (I did purchase two 2 1/4" and two 3" torca clamps from www.frozenboost.com as was suggested). I was almost certain I'd have to take it to an exhaust shop for some welding, but nope!



Attached Thumbnails
Exhaust Headers '00 Bonneville-10qxu38.jpg   Exhaust Headers '00 Bonneville-cbc39.jpg  
jedwards83 is offline   Reply With Quote
Old 09-26-2011, 08:40 AM   #27
Retired Senior Admin

Expert Gearhead
 
Danthurs's Avatar
 
Join Date: May 2006
Location: Sheboygan Wisconsin
Posts: 29,661
Thanks: 0
Thanked 16 Times in 13 Posts
Danthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to all
Default

I just installed the same ones on a Wbody yesterday. Took me a bit over 2 hours.
Danthurs is offline   Reply With Quote
Old 11-14-2011, 12:11 AM   #28
Junior Member
Posts like a Ricer Type-R
 
Join Date: Apr 2011
Location: Kaukauna
Posts: 14
Thanks: 0
Thanked 0 Times in 0 Posts
wachs is on a distinguished road
Default

Its been a long project but I just ordered the clamps(not just doing the headers). Looking to get the headers ceramic coated. Just finished doing the porting on the heads. As soon as I get them back ,valve job, the cam and finally the headers will go on. Lots of good info on this site. I should be able to do all this with my eyes closed now. These headers do seem to be of desent quality for the money. Does anyone have any reports on how they hold up long term?
wachs is offline   Reply With Quote
Old 02-04-2012, 10:05 AM   #29
Junior Member
Posts like a Ricer Type-R
 
Join Date: Apr 2011
Location: Kaukauna
Posts: 14
Thanks: 0
Thanked 0 Times in 0 Posts
wachs is on a distinguished road
Default

jedwards83
What cat did you put on your speed daddys? I know you were looking for a part number/ brand? I didnt see any one give you any info on that. If you could maybe post what the part number is so others ,like myself, can purchase one.

Thanks
Chris
wachs is offline   Reply With Quote
Old 02-04-2012, 04:00 PM   #30
Member
Posts like a V-Tak
Thread Starter
 
Join Date: Mar 2011
Location: St. Charles, MO
Posts: 53
Thanks: 0
Thanked 0 Times in 0 Posts
jedwards83 is on a distinguished road
Default

Here'* the place I got mine:

http://performance-curve.com/catalyticconverters.aspx

I chose the Thunderbolt Metallic spun cat, which is just a Magnaflow knock-off. You'll need one that'* 3" to work with the headers.

Here'* how I connected everything to my stock H-body exhaust:



I didn't even have to weld a thing, though I will weld it all eventually for good measure.
Attached Thumbnails
Exhaust Headers '00 Bonneville-cbc39.jpg  
jedwards83 is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Ported Exhaust Headers Twister97 Performance, Brainstorming & Tuning 10 03-01-2005 10:45 PM
Exhaust Question : Headers & Exhaust Charlie Performance, Brainstorming & Tuning 29 08-09-2004 11:03 PM
Exhaust Plans--Headers to Tips? TaylorD 2000-2005 10 02-02-2004 01:39 AM
1993 SSEi Exhaust Headers ?? con10der Performance, Brainstorming & Tuning 15 03-03-2003 07:38 PM


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 10:31 AM.


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.