Do I also need new bolts with this kit? also would this work with a E93 328i M-sport suspension?

This would work for the E93, and new hardware is not entirely necessary, only preference.

Is TRW quality better then MEYLE, or what’s the difference and how come TRW is no longer available

The quality is comparable, however all Meyle parts are more readily available to offer in kit form.

Do I need to upgrade the control arms on the rear of the vehicle to M3 arms as well. Or can I leave the standard rear suspension?

You do not have to upgrade front and rear at the same time.

Is this 5-piece control arm kit for replacing the front AND rear lower control arms?

No, front control arms only in this kit.

why are these now Meyle and no longer TRW? can i expect the same result?

TRW has changed their manufacturing processes on these arms and are no longer of the same OE quality; the Meyles will function to the current TRWs at the same effect, yes. The specifications of the control arm remain the same and will achieve the same degrees of negative camber as intended.

Is there a break-in process for this or can I install this and instantly get on the track ?

There is no break-in.

With the shift in production, are these still forged arms, and are the bushings OE-grade or aftermarket quality? Thanks!

The thrust arms are cast aluminum and no longer an OE part. The wishbones are forged aluminum and a made in Germany OE part.

Will this fit a 07 335i convertible

This fits all 2007 BMW 335i's regardless of body type.

What are the alignment specs (camber, toe etc) when installing these on 2007 328i?

OE alignment specifications can be followed when installing this kit. Note: The lower control arm is slightly longer which adds approximately .75° of negative camber helping reduce understeer and drastically improving turn in response without having a significant impact on tire read life.

I’m running 18x9.5 wheels lowered …will this kit make the tires hit the will they clear or rub when turning

Unfortunately, we cannot determine if the wheels stated can fit your vehicle as multiple factors such as tire size and offset play a role in wheel fitment accordingly. However, the lower control arm is slightly longer which adds approximately .75° of negative camber.