Just out of relative curiosity, what are the rough estimates on cost for each of these mods?

Intercooler?

Downpipe?

Catback exhaust?

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2008 e60 535xi : Alpine White / Natural Brown / Poplar : Auto : Sport : Prem : Nav : Cold Wx : Comfort Access : PDC : Sirius
Aftermarket: Cobb AP Tuner : K&N Air Filter : Trinity 12W Angel Eyes : Clearbra : Tint : 12mm H&R spacers on rear : Michelin Pilot Sport A/S Plus Tires : Debadged : Matte Black Kidney Grille : OEM M5Tech Front Spoiler