Ima go with a 4 overall. I love the customer service they have provided. I call in ask questions and get amswers. I bought my spulen boost pipe kit and did have a little fitment issue with the throttle body pipe. I don’t blame them what so ever since it was probably designed for oem intercoolers. I would suggest some more RND be put into the pipe maybe give 2 options for stock fitment or aftermarket intercoolers up to 2.25 inches thick. I will be ordering cooling fans as a fix to my problem just been a Lil depressing to hear my fan hit my brand new pipe. I will stick with USP for sure I think the spulen brand that they in-house is a great idea just hope they aren’t running into other issues like mine with other parts

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