BADASS of New England

An automobile club for the enthusiast who enjoys the last of the big GM cars. The rear wheel drive B and D bodys. Chevrolet Impala SS, Caprice, 9C1, Buick Roadmaster, Oldsmobile Custom Cruiser, Cadillac Fleetwood
 
HomeHome  RegisterRegister  Log inLog in  
Log in
Username:
Password:
Log in automatically: 
:: I forgot my password
Who is online?
In total there are 2 users online :: 0 Registered, 0 Hidden and 2 Guests :: 1 Bot

None

Most users ever online was 101 on Fri Nov 27, 2015 1:40 pm
Latest topics
» Harness wanted
Yesterday at 5:37 pm by MASShole9C1

» 9c1/SS rear disc brakes
Yesterday at 4:06 pm by MalibuSSwagon

» Badass Cruise 2017
Yesterday at 10:34 am by MalibuSSwagon

» This forum needs a pulse check.... pics included
Tue Feb 21, 2017 8:52 pm by sdstick

» WANTED DR side Exhaust manifold
Fri Feb 17, 2017 12:44 pm by fatvet

» '94 Suburban
Mon Feb 13, 2017 7:47 pm by boojum

» Can anyone run a vin 92 Caprice
Sat Feb 04, 2017 11:07 pm by MASShole9C1

» WTB OBD1 Hypertech for 94 Roadmaster and 9c1 center caps
Tue Jan 31, 2017 2:35 pm by CrashMaster

» 1996 Impala console and shifter for sale
Mon Jan 30, 2017 1:08 pm by No Moa

Search
 
 

Display results as :
 
Rechercher Advanced Search
February 2017
MonTueWedThuFriSatSun
  12345
6789101112
13141516171819
20212223242526
2728     
CalendarCalendar

Share | 
 

 Sleeving the Cats...Pros/Cons? Anyone.....

View previous topic View next topic Go down 
AuthorMessage
cloud 9



Posts : 563
Join date : 2009-10-03
Age : 48
Location : Dover, NH

PostSubject: Sleeving the Cats...Pros/Cons? Anyone.....   Fri Oct 04, 2013 8:04 pm

Been reworking my exhaust a bit. Found a bottleneck after the muffler. So I am running 2 1/4 to a pair of Flowmasters. I have an H pipe installed, so after the mufflers it went down to 2 inch, doesnt sound right. So I picked up a pair of over axle Dyno Max pipes at 2 1/2 from Rock auto. Great deal, they were only $87 shipped, and I want to punch the cats out and sleeve them. Its a 94 so I am not worried about emissions.  Just wondering if I would have any problems with power loss due to not enough back pressure. I'm sure some of you crazy bastards have experimented with this before. Thanks in advance for any advise.
Back to top Go down
IMPALADAKID
Admin


Posts : 1512
Join date : 2009-01-17
Age : 48

PostSubject: Re: Sleeving the Cats...Pros/Cons? Anyone.....   Sat Oct 05, 2013 6:16 am

Cut right in the middle of the up stream weld. Remove all material. I think the cat pipes are 2.5 so take a piece of mild stainless. Make sure the opening in the cat shell is big enough for it to slide in. Mark the end to be cut on your piece, and pull it back out. Now measure that distance to the down stream side of the case, and drill four 3/8 size holes, equal distance apart. The holes should be in the weld. With the piece cut flush, stick it into the case, and weld the down stream holes shut with stainless welding wire, and smooth out with angle grinder. This should catch the down stream side of the pipe. Now reinstall both pieces of the cat back on the car. and tack both together in several places. Remove, finish weld with stainless wire, and reinstall for a final time, and check for leaks. Do make sure that what ever material you remove from the cat case to enlarge the hole to fit the pipe is added to the end of the pipe to make up the difference.

_________________
2014 Chevrolet Silverado LTZ Z71 5.3 Aluminum V8 (My daily)
2007 Pontiac G6 VL 2.4 I4 (Wife's Daily)
Back to top Go down
cloud 9



Posts : 563
Join date : 2009-10-03
Age : 48
Location : Dover, NH

PostSubject: Re: Sleeving the Cats...Pros/Cons? Anyone.....   Sat Oct 05, 2013 8:02 am

No negative back pressure problems then?
Back to top Go down
IMPALADAKID
Admin


Posts : 1512
Join date : 2009-01-17
Age : 48

PostSubject: Re: Sleeving the Cats...Pros/Cons? Anyone.....   Sat Oct 05, 2013 8:21 am

This should make it a straight shot. Just make sure the pipe size at the cat is 2.5. I am sure it it, but it might be 2.25.

_________________
2014 Chevrolet Silverado LTZ Z71 5.3 Aluminum V8 (My daily)
2007 Pontiac G6 VL 2.4 I4 (Wife's Daily)
Back to top Go down
Sponsored content




PostSubject: Re: Sleeving the Cats...Pros/Cons? Anyone.....   

Back to top Go down
 
Sleeving the Cats...Pros/Cons? Anyone.....
View previous topic View next topic Back to top 
Page 1 of 1
 Similar topics
-
» Spray Basting
» Competitive Hieratics
» using variac, pros and cons
» Pros & cons of living in New Hampster?
» Pros and cons of using solid state rectifiers in Dynaco amps ?

Permissions in this forum:You cannot reply to topics in this forum
BADASS of New England :: 91-96 B & D-body tech :: Modifications / Performance-
Jump to: