Celebrating 20 years of selling the highest quality parts at the lowest prices. Guaranteed.

"Your products rock! I really enjoy your stuff, it makes building a car so much better. All the angles, bends, sizes, etc-- great stuff. I really like the new intercooler piping that has the heat cores-- too cool. "

"hi, just thought id let you know i have recieved my order, and am very happy with it, and extremely impressed with your service. i have passed on your good deeds to a few freinds who will be buying water to air intercoolers and other accesories very soon. cheers"

"Thank you for having the best prices that I can find. I have looked for hours on line and spent hours going from auto parts house to parts house and you have the best prices around."

"Now this is service!!!, item shipped within a hour of ordering!!! I own a shop and will be passing your info on to anyone I know."

"I ordered a 45 degree angle 2.5 inch diameter coupler and I want to say I am very satisfied with the quality. Fast shipping as well. Thank you."

"Thanks for the response. We have an inside joke that you guys only hire ninjas with how fast your service is. SIS is definitely the first place I check for parts. You guys have a great thing going on there. Thanks!"