Updating Cars.wad file

I have been trying this week to update my cars.wad file with the new cars from 2016 Cars by RSCT but my wad file size has grown to 1.1GB.
When I try the wad file ingame, the PO goes up to over 3000.

Can anyone help/advise?

I have been trying to update to the new Renault and Haas Liveries.

I am using WadUpdater 3.4

My graphics settings are:

Resolution = 1024 x 768
car geometry = high
trackside geometry = medium
texture detail = high
pitcrew = high

LAMH DEARG EIRIN

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GPGSL Alpha Motorsports, S13 Race Driver #8 S14 Race Driver #2, S15 Race Driver #2

I also had This problem. In my case, It worked to reduce the textures size by half using slimtex.

Do you mean the car textures or all textures as I tried to update the helmets as well.

I have got a workable wad from a previous by just adding the Renault and Haas liveries
But the order of the teams are wrong. Had to rename Renault to sauber and Force India to Jordan.

Where can I get a copy of SlimTex from? I do have of TexResizer 3.4 would that do the job?