K&N intakes are usually around $200 for our trucks.....Exhaust is another story. Some shops are cheap....some expensive. Take mine for instance....I was quoted $600 at one shop, $500 at another.....and few others were in the $300 range. All were aluminized 16ga tubing 2.5" in/2.25" out......and those prices were without tips. I got my single 2.5 catback hung for $150, and my muff was $60 off ebay, and my tip was $25. Dual costs more.
You can get those gibson kits...or magnaflow kits. I believe the gibson's start at like $250 and go up to like $500. The magnaflow kits are all like $600....But i've never really got quotes. But I rather go the all custom route at a shop where they make the bends and all that jazz.
'01 XLT disguised as a '03 Fx4 Level II
Big. Loud. Slow. Bright.