I looked around and didn't see a DIY for the Borla Exhuast system for the Civic Si. I just installed it myself a couple days ago and decided that I would share with those looking to do this.
1. Make sure you have everything you need to do the job. I used a 10mm socket, 12mm socket, flat head screw driver, wd40 (or other lubricant), pry bars (or something to help get the rubber hangers over the nubs), safety glasses, and gloves.
2. jack up your car from the rear as high as you can get it (please remain safe). If you have access to a lift, then it will be even easier. I used a normal jack and stand. Remember that safety always comes first. In order for me to jack up my 2015 Si, I had to remove two plastic covers. they can be a pain, but they're held in by clips and 10mm bolts.
3. Remove the support bar from over the exhaust pipe, located right behind the catalytic converter. there are two bolts that hold it. then remove the three nuts that connect the exhaust pipe to the catalytic converter. they are 12mm. It may be useful to use a lubricant to help loosen them up.
4. remove the two bolts that connect the exhaust pipe to the first resonator. the springs will not bother you, and will come out with the bolts.
5. you'll have to unhook 4 rubber hangers from the chassis. on is located about half way down, another is shortly before the first resonator, the third is located directly behind the tire, and the last is located between the muffler and the bumper. they can be a real pain to off, especially the last one, since there isn't a lot of room. If you have a pry tool, it'll be easier, but i was able to get the first two off with a pair of pliers and a screwdriver. the third one is easier if you come from the outside and through the wheel well. you may want to get someone to help you push and hold the pipes up. spray wd40 on the hangers where the nub is. Only worry about the ones that parts that are connected to the chassis.
6. extract the pipes from the chassis.
7. take three of the rubber hangers and put them on the new Borla exhaust system.
8. take the first piece and attach it to the catalytic converter (it may be snug, but it'll only go in one way), reattach the three 12mm nuts.
9. you can go ahead and reattach the support bar too.
10. slide a clamp onto the end of the first piece, Do not tighten, just let it hang there for now.
11. slide the second piece onto the first and attach the rubber hangers to the respective points.
12 slide the other clamp onto the second piece and let it hang, don't tighten the first one yet
13. slide the third piece onto the second piece and attach the rubber hanger down by the bumper.
14. make sure everything is straight and aligned correctly. be sure to check the tip and see if it's straight.
15. tighten the clamps as tight as you can.
16. lower your vehicle and reattach the plastic covers.
17. Start your vehicle and listen to it purr.
That's it. It's pretty easy and straight forward. the rubber hangers are the hardest part, but if you can get your hands on some good tools, you shouldn't have too many issues with them.
Overall, I am very pleased with the Borla Cat-Back exhaust. I noticed immediate gains and it has a beautiful sound. It's not too loud, but it has a nice deep sound.
I'll try and post pictures soon, but if you have any questions, feel free to ask.
1. Make sure you have everything you need to do the job. I used a 10mm socket, 12mm socket, flat head screw driver, wd40 (or other lubricant), pry bars (or something to help get the rubber hangers over the nubs), safety glasses, and gloves.
2. jack up your car from the rear as high as you can get it (please remain safe). If you have access to a lift, then it will be even easier. I used a normal jack and stand. Remember that safety always comes first. In order for me to jack up my 2015 Si, I had to remove two plastic covers. they can be a pain, but they're held in by clips and 10mm bolts.
3. Remove the support bar from over the exhaust pipe, located right behind the catalytic converter. there are two bolts that hold it. then remove the three nuts that connect the exhaust pipe to the catalytic converter. they are 12mm. It may be useful to use a lubricant to help loosen them up.
4. remove the two bolts that connect the exhaust pipe to the first resonator. the springs will not bother you, and will come out with the bolts.
5. you'll have to unhook 4 rubber hangers from the chassis. on is located about half way down, another is shortly before the first resonator, the third is located directly behind the tire, and the last is located between the muffler and the bumper. they can be a real pain to off, especially the last one, since there isn't a lot of room. If you have a pry tool, it'll be easier, but i was able to get the first two off with a pair of pliers and a screwdriver. the third one is easier if you come from the outside and through the wheel well. you may want to get someone to help you push and hold the pipes up. spray wd40 on the hangers where the nub is. Only worry about the ones that parts that are connected to the chassis.
6. extract the pipes from the chassis.
7. take three of the rubber hangers and put them on the new Borla exhaust system.
8. take the first piece and attach it to the catalytic converter (it may be snug, but it'll only go in one way), reattach the three 12mm nuts.
9. you can go ahead and reattach the support bar too.
10. slide a clamp onto the end of the first piece, Do not tighten, just let it hang there for now.
11. slide the second piece onto the first and attach the rubber hangers to the respective points.
12 slide the other clamp onto the second piece and let it hang, don't tighten the first one yet
13. slide the third piece onto the second piece and attach the rubber hanger down by the bumper.
14. make sure everything is straight and aligned correctly. be sure to check the tip and see if it's straight.
15. tighten the clamps as tight as you can.
16. lower your vehicle and reattach the plastic covers.
17. Start your vehicle and listen to it purr.
That's it. It's pretty easy and straight forward. the rubber hangers are the hardest part, but if you can get your hands on some good tools, you shouldn't have too many issues with them.
Overall, I am very pleased with the Borla Cat-Back exhaust. I noticed immediate gains and it has a beautiful sound. It's not too loud, but it has a nice deep sound.
I'll try and post pictures soon, but if you have any questions, feel free to ask.
