I think I am going to give the Dynoport a try on my stock 2006 Trailblazer. I have read that the stock clutching will work just fine but will a primary spring change help at all? I would be willing to do a simple spring change if any performace gains could be made. I also think I will go with the Dial-A-Jet kit too since the temps vary so much in New England.

 

Dynoport pipes are very good. I would change the primary spring though so you can get the full effect.

 

Good choice on pipe.But you will want to instal the proper main jet and not a Dial a jet alone.
Go with a Polaris white or EPI red primary spring.

 

Won't the Dialajet be able to compensate for the lean condition the pipe causes?

 

I wouldnt trust the Dial-A-Jet for rejetting.Jet the carb to the pipe and then if you want to fine tune or change elevations us a DAJ.

 

I'll take your advice since I trust you. I have been reading these posts for about a year and notice your advice always seems accurate. What benefits should I notice with a change to the white spring?

 

You will see all around better performance with the white spring but not too high of engagment.
It is actually what Polaris shoud have been using in the Trailblazer to begin with.