It's not hard at all.....I just installed mine yesterday and it took about 40 mins....spent most of the time to take off nuts from studs(you'll know what i mean if you read DIYs).
Just did this over the weekend with my Injen Cai, Used the napa 7777 rad hose to make enough room for the cai to bolt back up with the tbs on. Wasn't too bad at all just had to wait forever for the car to get the air outta the lines.
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