Throttle response
 

I have a '07 Mazda 3 Hatch, and have owned it for 2 months. At first it seamed great but now after spending 2k miles behind the wheel I've noticed a few issues. The throttle response is no were close to instant. I was wondering if anyone else has noticed this and if so do you know if there is a remedy to fix or improve this issue? I also noticed that the car is not as stiff in the turns as it seemed to be the day I purchased it. Is there anyone that makes strut braces for the 3? Thank you for any good advice!

I think you might just be getting used to the car by now, and it just doesn't "feel" as fast or tight around the corners. Everything should still be alright I hope. GTSpec should make strut braces for the 3, and there's actually a sale on this forum for a whole lot of different suspension parts. See link below for details, there are no Mazda 3 parts listed but he should be able to get you some anyway.
https://www.mazda3club.com/vendor-section-88/suspension-sale-springs-coilovers-shocks-strut-sway-bars-camber-kits-strut-bars-43029/

Have you changed the oil since you've taken ownership of it? Brand new engines need oil changed more frequently than once they're worn in, so that could be a factor.

Your right, I'm getting use to the car and have started seeing the areas that could use improvment. I will have the oil changed tomorrow even though the car only has 2029 miles on it. Thank you for your advice

a ground kit (home made or like the buddy club condenser kit) should help you in throtle response. it wasn't a drastic difference, but it is noticeable.

here's my setup (please ignore the stock air box)

Attachment 10395