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Probably none... I don't think the pipes sticking out a 1/4 inch more will alter the flow of air a significant amount... That's the only real difference.
but if you have rear diffuser issues there is nothing this can't solve.
So the Street System is now installed... I have to say it is significantly quieter and still has that don't mess with sound. We will be putting the ISF back on the Dyno tomorrow and will post the dyno sheet and a new video with the sound clip asap. I have to say, you ISF owners are very lucky. Lexus has really outdone themselves with this car.
Probably none... I don't think the pipes sticking out a 1/4 inch more will alter the flow of air a significant amount... That's the only real difference.
but if you have rear diffuser issues there is nothing this can't solve.
Really, a bumper is going to give you down force? That is far from a real diffuser.
I weighed it in the box and it weighed 78lbs. I figure 3lbs for the box so it's 75lbs more or less. We also have some extra flanges that give it the ability to convert to the street system without buying a new system. I'll weight it on a better scale at a friends shop without the box on Monday. The power increase you get out of the system is worth the weight. I will also weigh the stock system. It seem heavier then our system but only the scale can determine that.
Thanks for the heads up!
Last edited by Fitment Factory; 07-03-09 at 08:49 PM.