Hey guys im running the magnacharger 112HH kit on my RCSB 5.3 sierra. Other then the magnacharger kit and a gibson cat back system the truck is pretty much stock. What im wondering is if i install a set of long tube dynatechs with cats will i need a tune immeadiately? I plan on doing some kind of intake and pullying down in the future and was hopeing to see the dyno only after that.

 

A custom tune will definitely help, with or without long tubes. With LT's, I noticed a much stronger top end, but a little loss of low end. You can get your lost low-end back by pullying down to regain the lost boost with the addition of LT's.

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If youre running the stock maggy tune then you will be fine since it is very rich, but you really should get a custom tune.

 

I understand i will need a custom tune to really get the power out of the radix and headers but i would like to have it tuned on a local dyno and dont want to have to pay for it several times. If just bolting them on caused me to loose low end power i would be disappointed.... Would it be a better idea to wait until i can afford headers,pully,intake and a tune all at once?

 

Your combination of additional mods will certainly benefit/shine with a custom tune and it would be best if you can wait to do this all at once and then finish it off with a custom tune. Around here a dyno tune runs $400 and any updates/changes for additional mods are $100 after original tune is purchased.

 

Im debating doing the 90mm j-tube and TB conversion with an intake and pullying down with some headers and a tune this summer. It looks like most people with the radix are using the airaid systems, any other sugestions for an intake or anyone selling a j-tube?