what's up guys, just gotta 2018 is300 base and looking to build it. It's hard to find parts for the base model tho. Anyone know of any rear diffusers and front lips that fit the 2018 is300 base model?

 

Welcome to the forum!

Check out this company, they are also a vendor here: https://www.niaautodesign.com/

 

yeah I seen that site but their product is very pricy, know of anything else?

 

This is what "very pricey" looks like: http://artisanspirits.co.jp/car-line...-bl/index.html(these people are on crack)

For the rear diffuser, if you plan on swapping out the exhaust, then you can use any diffuser that fits 2014+.
The mounting of the diffuser on the 3IS is the same for all the years, just the exhaust tip of the 2017+ limits what can fit.

You can check here: https://www.ikonmotorsports.com/makes.html?cat=5360&p=1

There's also Skipper, Aimgain, and Seibon...but they make NIA Design look affordable.
You could also swap out the rear base diffuser to the F Sport one of the same year. You could look for one that something replaced on their IS and has it just kicking around now.

 

Thanks man, you know if for the front lips, if the f sport ones also fit the base model, because I seen one on Nia that fit both?

 

It will fit both. Even though the F Sport bumper looks different, the contour of the bottom is the same for the purposes of the lip.
Plus on their website they have pics of it on both Base and F Sport.
They are a vendor on here, so you can always message them to double confirm...plus they like have a Club discount too.

Note: They mention it will fit 2017+ IS250...which doesn't exist...but it's not a hill to die on.

 

Ohhh okay. You think the same applies for other non NIA products?
Something like this:
https://www.ebay.com/itm/FOR-2017-19...wAAOSwVLRaWXbj
or
https://www.ebay.com/itm/Fits-17-19-...cAAOSwj-RcEgx6

 

Looking at the pics it looks like they would fit...even though they say F Sport only.
I think you're at a crossroads of "you won't know until you try".
If you have a local Lexus dealer, maybe park your Base next to an F Sport and have a look at the bumpers for yourself.

 

Any updates to your build? I was curious as well to some of the diffuser applications base vs Fsport. I have a base as well for various reasons, but after seeing aftermarket support I sometimes regret not getting the Fsport.