I've badly beaten 5 different players in BG4's battle mode, but I can see that most of them are IDAS players because they tried to use machinegun shifting while cornering. -_-'
NO. Machinegun shifting do not work with the Battle Gear series as those noobs discovered very soon.

Also, there is BOOST like Initial D in Battle Mode and it is ON by default.

The new music for the 5 tracks are great but there is a mixture of old BG2 and BG3 music selection to choose from.
There is 2 speakers behind the seats and another 2 speakers in front of the player mounted on the rollcage.

LOL! Yeah, remember not to knock your head on the rollcage when you get in or out of the seats.
I just grab the rollcage with my both hands and jump out from the seats for the coolness factor.

The graphic looks better and you can see there is a driver in the car like IDAS. The NSX orange colour now looks like golden brown colour and it looks real cool. The graphics are high resolution at 800*600 and the racing tracks looks really good.

There are 5 tracks available and now there are European cars joining the lineup.
I can remember Ford, Mini, Renault, Citroen, Peugeot and Volkswagen but I think you can get most of the info from the BG4's website anyway.

There are 9 levels of COMP difficulty and the default level is at level 3.
I think veteran BG3 players should have no problems battling with the COMP until level 5 or 6.
COMP level 6 onwards will use their NOS and I think they have unlimited NOS stocks.

Gameplay is very different just like bunta666 reported.
After you choose your car, transmission and track, the is an option to select your tune.
There is Normal, Street, Sports, and Racing tune.
The normal tune will not change your car's class and appearance but the Street, Sports and Racing tune will have different bodykits and will immediately convert your car to Class-S.

Generally, the "Racing" tune is about 10 seconds faster than "Sports" tune and "Sports" tune is about 10 seconds faster than "Street" tune.
However, Class-C or Class-B converted to Class-S is not as powerful as Class-A converted to Class-S of the same tune.

"Racing" tune have 3 shots of NOS!!!
Now that's lame, who would want to use NOS in touge race??

Now, the game will punish the player severely, if you tap the walls for 2 secs and above or bump into other cars.
The RPM will drop to 3k-4k and will slowly go up for the next 3 seconds.
However, I think the Graze Wall Technique is still usable, but it is risky to do so.
Similiar to BG3, if you bump the COMP rival cars right on the back bumper, they will go faster and their driving line will not be affected much at all eventhough they are going through the S-curve. T_T Damn.

Also, there is weight transfer on the car models.
If you hit a hump, or being bumped by other cars, or going uphill too fast until you "hill jump" when there is a sudden downhill slope, the car will bounce up and down, or left and right ; causing 1 or more of your wheels to go off the ground.
When this happens, if you are flooring the accelerator, you might lose control and skid because the floating tyres have no traction and you will hit the engine redline IMMEDIATELY.

Due to the existance of weight transfer in BG4, a more precise PEDAL FOOTWORK is required from the player to control the car properly.
Controlling how much pressure you must apply to the pedals must be mastered even on the track (3/7) in BG4 itself compared to BG3's Dreadnaught and Super Dreadnaught tracks.

In the old Malaysian BG3 forum, I've posted a topic about how I notice there is TYRE WEAR in BG3 due to the difference in lap time in the circular course like Beginner; where your Lap 2 time is always faster than Lap 3, and also the noticable lost of grip in Lap 3 that causes understeer but it was not acknowledged by Hang at that time and he replied that there is no difference and there is no tyre wear.
Now, in BG4 I've noticed the tyre wear feature is still there but it is up to you to believe me or not.

So shinchan^^,   how fast is your Haruna (course 6/7) time now?

My current record is 3'20"xxx using both R-34 and NSX in MidValley.

Last course (7/7) record is 4'38"xxx with NSX. 

All records are done without using NOS and in bumper camera view.

initial d not real enough ma