the only problem with using so many couplers/reducers is the more you have, the more chances youll get a boost leak somewhere. it doesnt matter much on a sc cause the pipe from the sc to the intake is rather small, but on a car such as mine where theres around 11ft of pipe between the turbo and the intake, a pinhole leak will cause problems in performance, mileage, driveability. if my turbos making 20psi but only 15psi is making it to the intake, the boost controller sees that and upps the boost to make that 20psi, overworking the turbo by as much as 25%, leading to a short life span of the turbo. get enough boost leaks(or a big enough one) and you wont be able to drive anywhere with boost, it bogs due to being so rich. for me thats the only downfall of having a turbo, always seems that on a long race(3rd to 5th freeway pull) after being in 20psi for that long of a time you WILL get a leak somewhere.
1998 Eclipse GST Spyder - 14b turbo | 3" Catback | Evo8 BoV | 170fwhp if that
2003 Redfire Cobra - 448whp/435wtq - Sold