[frs_caskey]

Just bought a 2013 FRS dark grey metallic MT. It stock and has 40,000 miles. I want to start doing some simple mods and have some questions. This is the first car ill be modding.

1. In 3rd or 5th gear at 4000 + rpm while accelerating i get a rattle noise coming from the shifter somewhere and other shifts could be cleaner and more quiet. Dealership said there was a service bulletin about rattle in shifter but I was past the warranty. After research i found changing trans and diff fluid to Motul 300, getting new rear shifter bushing and maybe new springs could help solve these problems? I also would get new trans mount bushing.
Thinking of:
-Whiteline trans mount
-MTEC springs
-Perrin rear shifter bushing? is this the best one have heard one or two bad things about it?
-Motul 300 (4L)on its way (good for both trans and diff? right?)
Should anything else be done?

(EDIT: toyota is replacing my shifter under warranty for rattle noise. am still switching to motul 300 fluids. may get rear shifter bushing later on.)

2. New catback exhaust.
Dont want something to loud because its my daily and would like to keep it under $600 if possible but will go higher if i need too. Have been looking at:
J2 exhaust on ebay- there are 2 different ones.
Flowmaster american thunder
Nameless axleback 2.5" with 4" or 5" mufflers. hear good things but only a axleback and just as much or more than these other catbacks
Invidia N-1
Not sure how these perform, sound clips never do justice and most have other mods. Personal experience would be great on best budget exhaust for around $600 or under. Doesn't have to be one I've said.

(EDIT: after more research i chose the MXP Comp RS catback. great price and good reviews)

3. Last thing in my first wave of mods is intake. lots of people saying aftermarket SRI or CAI dont give much power or lose power. most people say to go with just a high flow drop in and maybe a new silicone intake tube. Opinions? experience? Should i go for the full intake system like injen or some other brand or stay with simple drop in?

(EDIT: going with Perrin drop in filter, temporary noise generator delete keeping stock intake pipe until i find reasonable silicone one.)

(EDIT: also saving for OFT)