Thanks Vitus78 for directing us to their web site and I will post their responses to emails from them. I did send them a link to this forum for the service manual. The basic consenses is that they will make parts for the US Market on the SX4 but only if there is a high enough demand.

SO THIS IS YOUR CHANCE TO TELL SOME ONE WHAT YOU WANT AND IF THE RESPONSE IS BIG ENOUGH THEN THEY WILL MAKE THE PARTS.

Here is what they have said about every thing so far:

Thank you for your inquiry from our website. (http://www.rsrs.jp/en/)
As for SX4 products, Suzuki Motor Corp had stopped to sell SX4 2000cc in
Japanese market and it is very difficult for us to obtain the information about
its details. There are no demands to tune up the car from Japanese customers
so we just only providing the some part common with Swift parts.

Please check the following correspond list of our products as for SX4.
http://www.rsrs.jp/en/correspondence_list/index.html

On remark, you can see the parts common with Swift car parts.
But if there will be a demand from USA market, we would like to consider if we design and develop the parts for Suzuki SX4 Sport.
It would be very appreciated if you could provide us any information about SX4 in US market and also what kind of products you are looking for.
We are very appreciated with your information and very helpful.

We had checked the monthly sale of SX4 all type in Japan.
2009
Jan 769
Feb 763
Mar 1332
Apr 518
May 483
Jun 699
Jul 739
Aug 399
Sep 399
Oct 521
Nov 510
Dec 454

As you see above numbers, SX4 is not popular car in Japan.

We guess Suzuki Motor Corp wanted to sell this car from the promotion of WRC like same success story of Swift Sport. But Suzuki withdrew from WRC in last year so their strategy in Japanese market has ended.

What we want to say is that if there’s no demand in the market, we can’t develop the products with investing the mold fee.

And we saw the website of roadrecemotorsports.com and found that most of products are imported from China or Taiwan and sells in cheap price. So we guess they can’t guarantee for the imported products.

If you think US market is marketable for us for SX4 tuning parts, it would be very appreciated if you could provide us further information.

Looking forward to hearing from you.

Best regards
T. Takagi Director
R's Inc