After market parts z sell price
 

If you plan on selling your z, do u guys think that having something as something as a k&n cai and exhaust system on it really add to the value of the car or have the opposite effect from a dealer standpoint and a private sell?

A stock car will always be worth more to a dealer and to most private buyers. Part it out.

Aftermarket parts never really add value and a highly modded vehicle will usually be worth less than a stock one (at least with cars). This is why it's never a good idea to put $$ into a car you don't plan on keeping a long time. The right private buyer might pay more for certain high-end mods, but it's not something to count on.

Motorcycle example: I have a '09 Ducati 848 with around 11k miles. It has Termignoni exhaust ($2000), Ohlins TTX36 monoshock ($1200), Ohlins 25mm fork cartridges ($900), Ohlins steering damper ($450), Dan Kyle linear rear link ($600), Woodcraft rearsets ($350), carbon fiber fenders and key guard parts ($400), CRG mirrors and levers ($250), Rizoma Lux grips ($150), Comp Werkes fender eliminator kit ($120), solo seat cowl ($150), Speedymoto fork and frame sliders ($200), Oberon 29mm clutch slave ($150), Zero Gravity wind screen ($100), and other random crap I can't even remember... That's easily $7k worth of primo goodies, but there's no way in hell I could ever sell my bike for KBB + $7k. In fact I'd probably be lucky to get $8k at this point.:rolleyes:

Moral of the story: Don't pour money into anything you ever plan to sell.

I have another question kinda off topic but I do have the typhoon k&n cai. "Not the best I know". But what would be a good catback exhaust that won't brake my bank plus give a better throatier sound and maybe a tiny gain? I love the fi one but it's expensive and I'm sure installation isn't cheap either. I would like better sound and maybe a bit more juice even know I hear exhaust dosent put out a whole lot of hp. Any recomendations?

Buy a used after market exhaust and save hundreds of $$$. If you have the ability to put the car on jack stands, then you can do the install by yourself with a few basic tools.

I'm confused. Are you selling the car? Your first post sounds like you're planning to sell the car, and then you're also considering modding it more?

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well i would like to put an exhaust on it and keep it untill the new model z comes out. then sell it for the new one. was hoping for the new z in 2015 but as we all know it doesnt look like that is going to happen untill 2016 now. seriously i wish they would gives us a teaser of what its going to look like and when we can expect it.

in your case how about just getting the muffler replaced? much easier (and fraction of the cost) to do than doing the whole catback. i saw someone on ebay selling axlebacks for like $250 new. they appear to be faux fujimura's or something. :ugh: