my buddy gots a third gen with l98. i think its a 91. he wants to take a 4th gen catback exaust and put it on his car. its a slp loudmouth exaust. does any one know if this just bolt right up or what will have to be tweaked or not work? etc help me out please reply

 

If it is from a LS1 car, where the pipe connects to the cat will have to be tweaked, sins LS1s exhaust basically comes down in a true dual style, before merging.

In all 4th gen cat back, the hanger rods will hafta be tweaked, since they are all a bit different, but thats not a big issue.

I have a LS1 cat-back on my 87 GTA....
http://www.texas-speed.com/shop/item...d=195&catid=46

 

I have a 4th gen Borla catback on my 91. The mounting points are a little different, and where it connects to the cat. But nothing dificult. My install took less than 2 hours.

 

Loudmouth here too

I have a custom Y so I just fitted that to the catback. All mounting points were changed. I used universal hangers (long rod) and welded a flat piece with a hole in it so I can bolt/unbolt the system should I decide its not cool anymore

Yours wont be a bolt-in deal unless you fab it to be so

 

would u happend to have a sound clip of this
?

 

To whom is that directed to?

 

my bad man still gettin used to this forum i was asking Stephen

 

Here is my Photobucket of various videos. You can go through them & hear them from inside & outside the car.

http://s119.photobucket.com/albums/o...itegta/Videos/

 

thanks man now i dont no what to do lol im diversed beetween the hearthrob kit and this how was the quality of the kit??

 

The previous owner put the new Magnaflow cat & the 4th gen cat-back on, not me. From looking at it from under the car, it all looks great.

 

If you get the 4th gen's little hanger inserts, you can insert them into your thirdgen and the rear part of the cat back will bolt right up. The passenger side front mount is the same on both pretty much...atleast on the LT1 version. Maybe thats why I didnt get the LS1 version I cant recall.

I got a magnaflow kit for an LT1...which was a mistake. Because I ended up having to weld hangers to my tail pipes, when I could have just gotten the 4th gen version and bolted it up.

Here is how the hangers will transfer over...

4th gen outer piece. There are 3 of these.



Chassis inserts.



Openings under the thirdgen.



You snake them in from the side.





....

 

And Viola.



This is where Im not sure if the LS1 and LT1 are the same...



J.

 

what mods did you do to the cat mounting area if any, also pics if you have any

 

Anyone have an answer here. I have a 4th gen Borla, and when I mocked it up and it looks like the cat conection is not even close. Am I missing something? Thanks for your time.

 

Read Post #2. I talked about the (my LS1 cat-back) mid-pipe to cat connection need tweaking.

And you say "4th gen"...You should say "LS1" or LT1", as they are 2 different setups/ LT1=practically a drop-in. LS1s need the tweaking.

 

You just need to get a bend to match up the catback to the cat. Most likely a 45* 3in diam.

 

Sorry, it is for a 94 Camaro, so an LT1. I was hopping that some one had some pics or a better explanation as to how they did the tie in to the cat. So I can have all the parts when I go to install it. You know a pic is worth a 1000 words!

 

Guys- got to this party kinda late hopefully this will help you or anyone else working on this. Just installed an 02 SS factory take off exhaust on my 89 RS LO3.

1) Swapped the 89 LH tailpipe hanger to the RH side.
2) Installed a boneyard 98-02 LH tailpipe hanger on the LH side
3) Cut the first 24" off the original cat back exhaust for the cat connection.
4) Took this piece of pipe to the parts store and bought an adapter to go from this pipe to the fourth gen intermediate pipe ($4).
5) Mocked the system up under the car (note the RH tailpipe mount needs to be bolted through the square hole on the factory tailpipe)
6) Final trimmed the 24" original pipe, and welded it together.

To go a bit further the fourth gen exhaust I used had been cut off the original car just in front of the rear axle.
1) I made two flanges from 1/8" stainless plate (think header collector)
2) Welded these to the ends of the two pipes.
3) This enabled me to remove the exhaust for welding, and remove the complete system at any time without cutting or dropping the rear axle.

Hope this helps!

 

The search button saves the day again!! I was just about to make a thread asking about the swapping of 4th gen catbacks into 3rd gens and here it is!

So based on what was said, I should get one from an LT1 car instead of the LS1 cars right? Does it really bolt up in just a couple hours? My stock cat back has a few large dents in it and two tiny holes (tip of a pen) so I've been looking into exhaust upgrades lately. Is $300 a lot to pay for a used Borla catback? Is an electronic cutout even worth it or would you lose backpressure or something and it would be useless?

Mike

 

Just FYI:
There are three distinct versions of 4th Gen Exhaust. Trust me, I've owned a few.
"93-95 LT1 Single Cat
'96-97 LT1 Dual Cat
'98-02 LS1 (Dual Cat)

There are minor differences within the LS1s' forward of the cats as well, but for our purposes, make sure you know which Cat-back system you are talking about, because they are all quite different.

TA

 

So what we need is the 93-95 version? Ok... That helps narrow down the list of possible donor cars.