Well another successful LS7 exhaust done
05-06-2013, 06:55 PM
#1
Drifting
Thread Starter
Well another successful LS7 exhaust done
We did it again this weekend. On an '05 we installed the LS7 manifolds and H-pipe again. Reduced to a 2.5 inch catback. We're getting pretty good at this. Seem to always have the same problem though. Everything goes smooth except the passenger side cat back. Always a weird angle. Almost fits but off a few degrees. Learned one lesson. Install the passenger side manifold first.
These things make a big difference. 2 cars with LS2 done now and man you can feel the difference in the pull.
These things make a big difference. 2 cars with LS2 done now and man you can feel the difference in the pull.
yep, ls7's on my ls3..
05-06-2013, 07:09 PM
#3
Instructor
Getting ready to swap mine, possibly this weekend. Do you install with the manifolds already bolted to the cats or do you bolt the cats on after the manifolds are on? Seems like it would be quicker to have the cats already on, but I'm not sure if everything will clear.
05-06-2013, 08:02 PM
#4
Melting Slicks
this might help...read carefully...you won't be able to have cats bolted up..must install manifolds first...
http://forums.corvetteforum.com/c6-c...-09-coupe.html
http://forums.corvetteforum.com/c6-c...-09-coupe.html
05-06-2013, 10:06 PM
#6
Burning Brakes
Peter Pan: 2 Questions. 1) Have you also made modifications to the air intake? 2) After you installed the LS7/9 manifold and the 3" piping to the catback, was a performance tune necessary?
Thanks in advance!
Thanks in advance!
05-06-2013, 10:08 PM
#7
Burning Brakes
We did it again this weekend. On an '05 we installed the LS7 manifolds and H-pipe again. Reduced to a 2.5 inch catback. We're getting pretty good at this. Seem to always have the same problem though. Everything goes smooth except the passenger side cat back. Always a weird angle. Almost fits but off a few degrees. Learned one lesson. Install the passenger side manifold first.
These things make a big difference. 2 cars with LS2 done now and man you can feel the difference in the pull.
These things make a big difference. 2 cars with LS2 done now and man you can feel the difference in the pull.
Thanks in advance!
05-07-2013, 11:11 AM
#10
Drifting
Thread Starter
Mundo: Same questions for you that I asked of Peter Pan. In performing these exhaust mods Peter Pan: 1) Had you also made modifications to the air intakes? 2) After you installed the LS7/9 manifold and the 3" piping to the catback, was a performance tune necessary?
Thanks in advance!
Thanks in advance!
1. Do not have the cats bolted to the manifolds when installing. Position the manifolds from underneath 1st but don't attach to the heads. Have someone on top of the car assisting holding the manifolds. Then attach the cat to the manifold. The guy underneath attaches the cat to the manifold then holds the entire unit in place while the guy on top attaches the manifold to the heads. We learned do the passenger side 1st.
2. No you don't need a tune. With both '05s we did we noticed an immediate improvement. We got street tuned from Joe Delano in San Marcos and man what a difference.
3. If you're going to use your 2.5" catback then you need a reducer from 3" to 2.5" BUT.. the 3" must fit into the 3" H-pipe and the cat back must fit into the reducer. The reducer is about 5" long with 50% to the 3" and 50% to the 2.5". Our muffler shop in Ramona CA has these down. He's an ace at making these.
4. We found the driver side catback to line up real good and the passenger side to be a few degrees off (with reducer) which is challenging.
Contact MIKESREDZ on the forum. He has the lift and is the ace at these conversions.
We have a lift. It makes a difference.
05-07-2013, 11:18 AM
#11
Burning Brakes
Answers to the questions:
1. Do not have the cats bolted to the manifolds when installing. Position the manifolds from underneath 1st but don't attach to the heads. Have someone on top of the car assisting holding the manifolds. Then attach the cat to the manifold. The guy underneath attaches the cat to the manifold then holds the entire unit in place while the guy on top attaches the manifold to the heads. We learned do the passenger side 1st.
2. No you don't need a tune. With both '05s we did we noticed an immediate improvement. We got street tuned from Joe Delano in San Marcos and man what a difference.
3. If you're going to use your 2.5" catback then you need a reducer from 3" to 2.5" BUT.. the 3" must fit into the 3" H-pipe and the cat back must fit into the reducer. The reducer is about 5" long with 50% to the 3" and 50% to the 2.5". Our muffler shop in Ramona CA has these down. He's an ace at making these.
4. We found the driver side catback to line up real good and the passenger side to be a few degrees off (with reducer) which is challenging.
Contact MIKESREDZ on the forum. He has the lift and is the ace at these conversions.
We have a lift. It makes a difference.
1. Do not have the cats bolted to the manifolds when installing. Position the manifolds from underneath 1st but don't attach to the heads. Have someone on top of the car assisting holding the manifolds. Then attach the cat to the manifold. The guy underneath attaches the cat to the manifold then holds the entire unit in place while the guy on top attaches the manifold to the heads. We learned do the passenger side 1st.
2. No you don't need a tune. With both '05s we did we noticed an immediate improvement. We got street tuned from Joe Delano in San Marcos and man what a difference.
3. If you're going to use your 2.5" catback then you need a reducer from 3" to 2.5" BUT.. the 3" must fit into the 3" H-pipe and the cat back must fit into the reducer. The reducer is about 5" long with 50% to the 3" and 50% to the 2.5". Our muffler shop in Ramona CA has these down. He's an ace at making these.
4. We found the driver side catback to line up real good and the passenger side to be a few degrees off (with reducer) which is challenging.
Contact MIKESREDZ on the forum. He has the lift and is the ace at these conversions.
We have a lift. It makes a difference.
05-07-2013, 01:30 PM
#13
Drifting
Thread Starter
Not as clean as I liked it. The harness is a fabric tape wrap with some kind of black sealer on it. I used an Xacto knife and 'very gently' cut through the tape on both sides gently pulling the O2 wire back towards the fire wall. We got enough play and they connected to the O2 sensor connector from the O2 at the cat. We used a plastic tie strap to keep the wire safely away from the manifolds. The colored wires are exposed. May try to find some good thermal tape and re-tape what I pulled back. Anyone know a good thermal tape? Electrical tape won't do it. With under the hood heat it starts to un-ravel.
