Compression test
How many miles does your motor have? I think the problem is from worn piston rings. Try to get compression test done. If compression looks low, try to drop a little bit of engine oil into the cylinder from the spark plug hole. If compression rise up, that means you have worn piston rings. I've seen a few older SR20s with that problem and I have a feeling you have worn rings too.
p.s. You raced the XE and if the guy in XE was able to see the smoke from behind, that means your car's still running strong
How many miles does your motor have? I think the problem is from worn piston rings. Try to get compression test done. If compression looks low, try to drop a little bit of engine oil into the cylinder from the spark plug hole. If compression rise up, that means you have worn piston rings. I've seen a few older SR20s with that problem and I have a feeling you have worn rings too.
p.s. You raced the XE and if the guy in XE was able to see the smoke from behind, that means your car's still running strong