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Message: [QUOTE="KCTurbos, post: 979175, member: 13852"] If you are only planning on going up to 155s and you are looking for quick spooling and great towing then I would stick with a turbo option that utilizes the larger 13 blade turbine. We have done a TON of experimenting with vgt turbos, mods, sizes etc... One of the most interesting experiments we did was we took a stock injector truck and pushed it to the max with a stock turbo. We pushed it super hard on the dyno and got a really good baseline number. Then we added a 68mm turbo... the truck only gained about 25hp. We took the same truck with 190/100s and pushed it to the max on stock turbo. We tuned it on the dyno and got the most power possible out of it. Then we added a 68mm turbo and it gained 133hp... that is a huge gain. So with the same turbo changed it only gained 25hp on stock injectors and 133hp with 190s... Basically what I am getting at is turbo sizing is very important. I have worked with many people who were led to believe that larger turbos spool just like stock... THAT IS NOT TRUE. Of the line with a ton of fuel can help... but lock in OD at 1600rpms while pulling a load will make a big turbo have issues and feel very laggy and run high egts. That is why I say that I would stick with a 13 bladed turbine with your power and truck goals. You might lose out on a little bit of top end flow with a 13 blade turbine (only a couple hp) but you will gain a lot of bottom end spool up. We came up with a turbo design that should fit your needs perfectly. We have our KC stage 1.5 turbo. It utilizes the larger 13 blade turbine for quick spooling and great towing characteristics (not meant to be a race/dyno turbo) It is built for great daily driving characteristics and towing with stock and 155cc injectors. It will also work with 175s but it will not be able to completely clean up those injectors on a race tune. Stage 1.5 specs: 63.5mm 11 blade billet compressor wheel, .72ar race compressor cover, larger 13 blade turbine. (units built from brand new turbos receive billet high flowing vanes and stainless steel unison rings) Here is a picture with the optional polished cover (sorry this is the only pic I have, a customer sent it to me) [ATTACH=full]134465[/ATTACH] Let me know if you have any questions [/QUOTE]