The dyno on n e w c e l i c a . o r g comparing Injen
/tpr shows Injen
but quite a bit in the top end and ct's didnt. Dynos suck
1. in a perfect world, you shouldn't even compare dynos done at differnt times MUCH LESS done by different cars under different conditions--even when using the same engine type.
even when using a stock car with no aftermarket parts, dynos will vary because there are so many variables..weather, temperature, wind, much less talking about how 'healthy' the engine itself is (whose to say my 2zz runs the same as your 2zz??).
also take into account different dynonameters measure whp differently. there are 3 major dynonameters that tuners use (dynojet is the most popular for imports..but mustang dyno--not related to fords
-- is probably the most realistic.
so you can imagine the different results done by cars with different aftermarket parts on different dynonameters will show.
in a perfect world, all engines would be made the same, maintaned the same, tested the same and under the same conditions--then you would have a true look into what really does what.
2. it's obviously not a perfect world. so you obviously shouldn't compare different dyno graphs. you're best bet is to compare the DIFFERENCES in ONE particular dyno. look at what the gain (or loss) is between a performance part and its corresponding stock part.
3. don't ever use a manufacturer's dyno...use a trusted independent dyno.