Does anyone make stiffer secondary springs for the 09-2010 helixes?

[Frostbite]

I was wanting to test a couple of slightly stiffer secondary springs on my 09 M8.

I understand Cat has changed the inside diameter of their helixes since going to electronic reverse and now the Goodwin springs no longer fit.

I looked and I can't see where Speedwerx has one that's stiffer than the stock orange spring either.

Does anyone make a stiffer secondary spring that will fit the new style helixes?

 

[Frostbite]

The good folks at Goodwin Performance said that their blue (several varieties) were very popular with the Arctic Cat mountain sled community (that is until the helix changed). The stiffer secondary springs give you a much snappier backshift and may aid you in pulling that extra couple hundred RPMs you want to pull to reach your target RPM shift speed.

How are guys scratching the stiffer secondary spring itch on 2009 and 2010 M sleds?

Surely someone must have stiffer secondary springs that fit the new helixes?

Do Polaris secondary springs fit?