Loud intake noise/choppy acceleration (not quite bucking)

[Efried55]

Non PP with 107k now. Runs about 17psi, but recently can only hit about 13. First began noticing a much louder intake noise than usual. Had the car pressure tested for a boost leak when I brought it in for struts& brakes. No leaks found. Also installed a noise maker delete chargepipe. Only other symptoms include 02 cel that has come and cleared on its own & and I’m also noticing that on wot acceleration there seems to be a slight choppiness to the acceleration. Really don’t know how to describe it but it feels almost crunchy but isn’t actually bucking or anything. Any help would be greatly appreciated.
170° thermostat
3 bar
K&n cai
Tuned by torrie at UT.

 

[PaulTAutoX]

Non PP with 107k now. Runs about 17psi, but recently can only hit about 13. First began noticing a much louder intake noise than usual. Had the car pressure tested for a boost leak when I brought it in for struts& brakes. No leaks found. Also installed a noise maker delete chargepipe. Only other symptoms include 02 cel that has come and cleared on its own & and I’m also noticing that on wot acceleration there seems to be a slight choppiness to the acceleration. Really don’t know how to describe it but it feels almost crunchy but isn’t actually bucking or anything. Any help would be greatly appreciated.
170° thermostat
3 bar
K&n cai
Tuned by torrie at UT.

Guessing you didn't mean to post this in the Gen I/II engine forum, maybe try the other areas for Gen IV.

 

[kryptto]

Non PP with 107k now. Runs about 17psi, but recently can only hit about 13. First began noticing a much louder intake noise than usual. Had the car pressure tested for a boost leak when I brought it in for struts& brakes. No leaks found. Also installed a noise maker delete chargepipe. Only other symptoms include 02 cel that has come and cleared on its own & and I’m also noticing that on wot acceleration there seems to be a slight choppiness to the acceleration. Really don’t know how to describe it but it feels almost crunchy but isn’t actually bucking or anything. Any help would be greatly appreciated.
170° thermostat
3 bar
K&n cai
Tuned by torrie at UT.

crunchy - PTU oil changed last - transmission oil change last? should be every 30K on each. intake - rest the KAM and drive to temp then 20+ mins normal - see if the transmission learns again. no beating on it during the relearn. does the throttlebody servo open and close smoothly? be careful it will cut your finger/tips off.

 

[SHOrod]

Only other symptoms include 02 cel that has come and cleared on its own & and I’m also noticing that on wot acceleration there seems to be a slight choppiness to the acceleration.

Welcome to the forum!

Since 02 is not a valid diagnostic code, I'm not sure what you're referring to here. Was it a P0302 for a cylinder 2 misfire, which could explain a hesitation during acceleration?

-Rod