Aaron10 10 Posted July 18, 2017 Hi all, Upon further investigation and advice from yourselves (due to a no boost reading on the mfa) I am in the process of ordering up the vacuum pipe (3.5mm inside diameter as recommended) to change all the vacuum lines on the car. I just had a quick look and the hose going from the ecu to throttle body at the moment is only 3mm. How would this affect the car if at all? Quote Share this post Link to post Share on other sites