[SlowE92]

Short post, havent found much info on this. I ordered the ngk 2 step plugs (97506) for my e92 335. I have done the b58 coil conversion and am wondering if i should have gotten these or the 94201.

[SlowE92]

I figured this out. 97506 is fine with the b58 coil conversion. Delete this thread if needed.

[mainbearing]

Good to know about the B58 coil conversion. That is the way coils should have been designed from the start.

The N51/52 coil design is poor to begin with, subjecting the windings to excessive engine heat. Hopefully my Delphi coils will last longer after two sets of Bosch junk (factory clip-type and updated, non-clip type replacement).

[SlowE92]

Originally Posted by mainbearing

Good to know about the B58 coil conversion. That is the way coils should have been designed from the start.

The N51/52 coil design is poor to begin with, subjecting the windings to excessive engine heat. Hopefully my Delphi coils will last longer after two sets of Bosch junk (factory clip-type and updated, non-clip type replacement).

I think the delphi coils are very good, i just had to upgrade my coils when buying a single turbo since the b58 are rated for up to 1000 hp.