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

"Thanks for the great customer service! I'm planning on ordering from you again soon."

"Thank you. This is a sign of a good business, keep up the good customer service."

"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."

"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!"

"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. "

"cold air intake for my civic at 1/4 the price, and 10X the looks"