Upgrade questions for new SHO owner

[zerobane]

Hello,

Just bought a SHO; was poking at first upgrades to throw at it this week.  Forums were excellent; gave me a good idea on how to approach.

Coming from a WRX STI and Cobb world; the subby was super sensitive to any changes you made to it.  Wanted to know if SHO had the same problems and order of upgrades needed with custom tune.

ie: dropping a air filter on STI without tune caused it to ping and backfire; basically run like crap.  Same for any other change; you always needed to make sure the tune was correct for any aftermarket parts.  Made it challenging at times.

So was thinking the stage 1 kit from livernois; looks like the easiest way to get going?
https://www.livernoismotorsports.com/product/LPP0108453

1.  Can I add downpipes and exhaust without causing issues / no custom tune?
2.  Air intake / filter? 
3.  Thermostat?

Going guess the 3 bar map sensor is custom tune only.

Was going add what I can ahead of time and then tune when done, custom exhaust I will bring to a shop and then drive home, add rest of mods and then tune.  Trying to get an idea of best way to approach and minimize risk. 

[AJP turbo]

If you came from the cobb world and subie did you read on their site why changing the intake has a huge effect?..it uses a mass air flow sensor

The sho is speed density(map sensor) for primary fuel control....you can basically throw any bolt on on the sho but they dont make huge difference.....need a tune!

[SHOdded]

^ what he said   Yes, you can put in all the parts except the 3 bar without a tune, but the true potential requires a tune.