Your 60' is the most obvious thing that jumps out at me. You were able to cut a 2.1 60' time the week before, this time you cut a high 2.3 60'. A general rule of thumb is that every 1/10 of a second taken off of your 60' is equal to 2/10 in the 1/4 mile. That would put you close to your previous times if you had cut the same 60' time this time around.
Second, only the exhaust is the only power adder that was installed and it isn't going to make the biggest difference in the world with your current mod list. Your trap speed is close to where it should be with your mods and time of year. The sts isn't going to make you any faster either, nor is the t-stat. The MM's should help you with your 60' time, but for some reason they did not, but they won't increase your trap speed.
That brings me to my third point. Your track may not have been prepped as well this time around as it was last week. Has it rained recently? June isn't the best month to try and set blistering times because it's so hot and humid out which kills power. How much cool down time did you have between runs? Track prep and weather will also play a huge part and they may not have been as good this time around.
Finally, the answer that everyone else is going to suggest....do a boost leak test. These cars are notorious for having boost leaks, do a test and zip tie EVERYTHING you can. You probably have a few leaks that you don't know about that could be hurting you.
Second, only the exhaust is the only power adder that was installed and it isn't going to make the biggest difference in the world with your current mod list. Your trap speed is close to where it should be with your mods and time of year. The sts isn't going to make you any faster either, nor is the t-stat. The MM's should help you with your 60' time, but for some reason they did not, but they won't increase your trap speed.
That brings me to my third point. Your track may not have been prepped as well this time around as it was last week. Has it rained recently? June isn't the best month to try and set blistering times because it's so hot and humid out which kills power. How much cool down time did you have between runs? Track prep and weather will also play a huge part and they may not have been as good this time around.
Finally, the answer that everyone else is going to suggest....do a boost leak test. These cars are notorious for having boost leaks, do a test and zip tie EVERYTHING you can. You probably have a few leaks that you don't know about that could be hurting you.
