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my 02 has it

no check engine light but does send a code po1621 and i am having hard time finding what it is.

changed Have changed it 4 days ago and still have same problem

I have 03 chevy afe intake, bully dog power pup and working at mine site pulling a gooseneck trailer with 257B and a bundle of 5 inch posts with a honda four wheeler on the trailer, went I hit the bottom of the hill doing 5 mph the motor will not pull past 1500 rpms unless I put it in four low...

Also have doubled checked arrows on increase valve

Banks Bullet I have the bullet from banks. I run it in tow read 20 psi wot and then in sport and may hit 21-22. Also pull a 35 foot toy hauler and still do not get much over 20. The main reason I got increase valve was to help with exhaust gas temps while towing. I have 4 inch exhaust and aem...

Installed this and I am not getting anymore boost 20 to 22 psi. Was wondering if the waste gate was starting to go. 165,000 miles on this truck and I bought it with 150,000 so I dont really know how this truck was treated before.

Live in Star Valley, WY. Own a 02 Chevy Duramax with 160,000 miles. Work in construction and the work truck is 04 Dodge with 115,000. I live and work with nothing but diesel.