kosh2k

I am trying to get my LS2 CARB legal and was wondering if:

1. LS1 exhaust manifold bolts up to LS2?
2. LS1 cat pipe bolts up to LS2 exhaust manifold
3. Any issues with the O2 sensors or PCM when doing this?
4. Any issues with passing SMOG when using LS1 cats on LS2?

Thank you for any answers!

Kevin

kosh2k

bumpity bump

redtan

iTrader: (5)

What cars are you talking about here for LS1 and LS2 exhausts? LS1 manifolds will bolt up to LS2 heads but the rest of the exhaust might not fit if it's a different car due to the way the exhaust is routed under the car.

For example, you can take an fbody LS1 manifold and put it on a GTO LS2, but the rest of the exhaust might not fit.

So tell us what car's exhaust you're trying to put on what car.

joecar

If you're dropping an LS2 into a F-body, things to watch out for:

only the F-body exhaust manifolds will fit the car/chassis;

are you using your F-body 411 PCM...?
if the LS2 has the 24x/1x CKP/CMP reluctors, then it is compatible;
if the LS2 has the 58x/4x CKP/CMP reluctors, then it is not compatible, you will need the LPE converter;

if 24x/1x, then you will need a cam sensor extension cable (and check that it is not wired backward);

knock sensors are not compatible, you have to use the same kind that the PCM came with;

the smog tech will not know that it's an LS2;

to pass the emissions test you have to get it running correctly in closed loop.