i think that they should test upgrades extensively to learn how they work....not plugging 10 upgrades on the car and gain 0.500s but without having any clue how they work...if they learn how they work they might be able to extract another 0.250 for example...if u get what i mean!
I agree with this. It's imperative, I believe, that they fix the exhaust and related areas of the car above all others and to dedicate the time to getting this right is clearly necessary. Doing proper back to back testing with different exhaust solutions is a time heavy activity and not something that could be done properly at a race weekend (correct me if I'm wrong), so it's actually a good use of the test.
I don't think I'm alone in thinking that if they fix the exhaust they will also have fixed the sidepods (possibly drag depending on which solutuion they choose), be able to run more rake, less wing, higher top speed, and so this carries a lot of beenfits. But essentially this is about fixing the fundamentals of the car before they start bolting on new bits.