Thannp

Hey guys

We all understand that the stock exhaust for both IS250 and 350 are the same size.

How about the aftermarket one? Are there any difference or they are all the same?

Most manufacturer would say that it fits both engine and some offer and option for you to choose between the model but there is no spec-sheet to confirm that there are difference in size and diameter.

I am just wondering because the flow rate of both engine should not be the same since they are 1 liter apart in displacement and flow rate is very important when messing with the exhaust and don't want to loose power.

Thanks for the reply