Dyno before and after QTP longtubes and Y?
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). Just wondering how difficult it will be. 
4th gens are super easy. i had a lift & air tools at my shop it only took 3 hours for full header install minus the engine mounts.
i would highly recommend you install some poly or solid engine mounts before you install the longtube headers, its also a good time to install new spark plugs and wires if you got them, i installed new GM exhaust gaskets they work great. yes i have installed spings on 4 gens. you will need a good spring compressor tool and a alignment after the front springs are installed.
i had the the SLP suspension package, and installed koni 4/4 and Strano springs, and man it was a world of difference, so it was already about the same ride height but still needed a alignment and PHR for the rear.
good luck










