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I see these are rated at the same hp just the 500 has a bigger wheel...

Any other diffrences? Size? Weight?

Any feedback on these from people who have used them would be great
 

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Well theres a big difference in size and weight between the 400 and 500 chassis.. 400 is about 40-45 pounds...500 is 55-60. Depending on which housings are on em.

500 has about 6 different A/R choices on the turbine housing... 400 you are pretty much locksd into 1.

Wouldnt use the 400 on anything bigger than 300-330 inches. 500 would work up to 380-400.

S400-88 is better suited as a twin setup.
 
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