Maybe a half inch. It doesn't really stick out too far into the inlets.
Short drive review (secondary pipes) and other tidbits:
- Exhaust volume hasn't seemed to change all that much. It seems more noticeable when sitting at idle. I haven't accelerated quickly yet, so maybe it changes the exhaust note at higher RPMs. Although, I still have stock cat-back and that could be the reason the sound is not amplified. The resonators do a great job of eliminating drone. I heard none.
- You will need to purchase your own hardware and it was more of a job than I was expecting. I did not realize I would have to slide the entire exhaust backwards which meant removing quite a few components on the undercarriage and exhaust. Be aware that the stock exhaust uses studs and not bolts. The hardware that you will need are: four M10-1.50 x 50 bolts for the aft flanges of the secondary pipes, four M10-1.50 hex nuts, 16 10mm flat washers, eight 10mm split lock washers, four M10-1.50 x 30 bolts for the support bracket, and four flanged hex nuts.
- My biggest complaint is one of the resonators was not welded properly in the correct spot. The resonator extended slightly longer than the other, so when I tried to fit one of the M10-1.50 x 50 bolts into place I did not have enough space. I wanted all the bolt heads to be uniform and face forward to aft (shank), but I had to install one of the bolts opposite with bolt to shank being aft to forward. It was kind of a pain tightening the bolt especially since it was an upper bolt with limited workspace.
- If I were to do it all again I would definitely wait until I have a cat-back and just install everything at once. It would have made life easier.
- Also, wear mechanic's gloves. I sliced my finger pretty good on an aluminum support bracket.