Diagnostics for smoke under hard acceleration

Hi all,

2005 Legacy GT Wagon 5MT

155k

I'm seeing smoke in the rear view mirror under hard acceleration sometimes. Typically in third gear with a hard acceleration, stomp. I can't tell a specific color.

What are the recommended diagnostics to perform?

Compression Test

Leak Down Test

block tester to test for head gasket leak

Inspect turbo seal

I know I have a small oil leak from what I think is the Oil cooler gasket

Here is my mod list:

Cobb AP V2 with Tuning Alliance Custom E tune

Cobb Catless Up Pipe

Cobb Catted Downpipe

Cobb EBCS

JMP Custom VF 40* (probably 40k miles on it)

Grimspeed TMIC

DW65c Fuel Pump

Reference FPR to BOV, capped cyl 4

I want to get a health check anyway before the next step in mods. I'm going to post another thread specific to brainstorming what next.

Thanks.

compression test 1st cause its easy, if you get wonky numbers or are inconsistent, well your probably screwed at that point, but do a leak down to be sure and dial in on the issue.

You can drain the oil to check for headgasket leak, but the gt's aren't really known for blowing head gaskets its the 2.5i's.

Lots of smoke to me usually points towards a blown ring or bad valves/seals., oil is getting by the rings/valve seals and burning up.

inspect your turbo as well just to be safe.