Sorry I don’t have the VIN, the truck is not local, I have a 1998 2500 7.4 Vortec GMC Suburban. As I understand it I do not have the newer 0411 ECM and these have better processing power but need to be repinned. Is it possible to get the newer 0411 with your tune for my truck. ( Jim, 12/26/2019 )

Unfortunately this is not something that we offer.

I have a 2000 GMC school bus with the L21 7400 motor. Can you reprogram and net me the same HP & TQ numbers as the L29?
I'm of the opinion that your upgrade would be smarter than the carb, intake, cam, and distributor mods. ( Lyle, 12/18/2019 )

Yes, we can tune your L21 for similar gains as with the L29. We do not, however, have core PCM's for this engine so you would have to send your PCM in for the flash.

So I have a 98 K3500 with the 7.4L and I use it mainly for hauling, but I have began to daily it. I have a few questions so bear with me here. Are the tunes generic or do you change different things for different people? I am considering doing an EGR delete and I wasn't sure if this would accommodate that or if it will still throw a check engine light. You claim 40-55hp gains is that something that I will notice drastically or is it more of a subtle power increase? Thank you. ( Corey Wright, 12/18/2019 )

The tuning is custom to each vehicle depending on calibrations, modifications and any special requests. It is quite a noticeable difference!

Hello,
I have few questions for k3500 7.4l 1999 first the 45 to 50 hp gains is that on 87octane gas?

The next question could you custom tune ecm for turbo or supercharger with low boost application? And a 5 spd swap?

( James Sinclair, 12/12/2019 )

Yes, all gains listed are with 87 octane gas. We don't however specialize in forced induction applications so we would not be able to help you with that.

My question is you claim 40-55 hp gain on the 7.4l , and all the other tuners on the internet only claim 20-25hp gain, will I really see 40-55hp gain with stock engine, exhaust, and air filter? Also how much benefit do you think I would gain by going aftermarket catback exhaust.

Michael Moore
817-694-3652 ( michael moore, 11/29/2019 )

Our tuning is based off of extensive dyno testing of RV's, and while results may vary, our gains are generally higher than others due to our expertise in the tuning of the L29 7.4L.