Come join the discussion about performance, tuning, engine swaps, turbos, modifications, troubleshooting, maintenance, and more! … Home Forums > Civic Technical > Bolt-Ons And All Motor > Exhaust & Downpipes > RV6 2012+ Civic Si Bellmouth Downpipe Discussion in ' Exhaust & Downpipes ' … (catted) on stock exhaust. So has anyone figured out if its worth it to upgrade the front pipe and leave the stock down pipe in place? So does the front pipe really make much of a difference? For a better experience, please enable JavaScript in your browser before proceeding. It’s tiny. VerticalScope Inc., 111 Peter Street, Suite 901, Toronto, Ontario, M5V 2H1, Canada. Has anyone found a dyno chart with just a front pipe change? The front pipe attaches to the downpipe. Looks ok but im more pumped about the 3" UR Catless downpipe =). This high-flowing, yet remarkably quiet hand-made 3″ V-Band cat-back exhaust system will extract maximum performance from all motor (NA) and boosted applications Civic Si’s and Acura ILX models. View:,, (You must log in or sign up to reply here. I think the big boost is on the downpipe and, if you don't upgrade that, then the front pipe/exhaust w/front pipe will net you a slight gain but not the amount you get off the downpipe. In this case the issue is the catalyst the exhaust gasses have to flow through, not the diameter. Whatsup 9thgens, I got a 14 Si and need some opinions. Thanks again! For a better experience, please enable JavaScript in your browser before proceeding. Also remember that you won't need an aftermarket front pipe if you plan on buying almost any of the exhausts out now as most if not all are shipping with a front pipe as part of the exhaust. The downpipe (cat) and front pipes that replace our stock ones are larger in diameter (2.5" to 3") than the stock one (2"). As far as I know, you need to use a defouler to pass emissions with any cat-less downpipe. It sounds free flowing (I know not real helpful, but I don't know any better way to describe it). I installed a defouler as I ended up throwing a cell. The cat converter is on the downpipe. Sure, you'll make more peak numbers, but the slower exhaust velocity from the larger tubing will, like I said, result in lower gains in the low and mid RPM ranges where you do most of your daily driving. The person running the dyno indicated that it was the type of dyno in use that caused it to read low. The larger diameter front pipe helps with power even if the rest of the pipe going to the muffler is only 2". By the time it has exited the front pipe, it has cooled sufficiently and the 2" dia. my question is can i use my old gasket and bolts on the si exhaust? So I have a stock downpipe with a 2.75" N1 exhaust and am looking to upgrade my DP to a 3" fullrace catted, along with the rear motor mount. - The car is more responsive and it is even easier to chirp the tires into 2nd. Discussion in 'Build Threads' started by Anthony Chen, May 9, 2014. We ran the tests on my car completely stock and I was shocked by the low dyno numbers. Remember, a 3" exhaust may invariably affect your down-low torque. Search titles only; Posted by Member: Separate names with a comma. The catalytic converter is the only true restriction in the stock exhaust if you are running the stock turbo. Anthony Chen Well-Known Member. JavaScript is disabled. No one has tested it or any exhausts so far as we know. ok i just bought a used si 8thgen exhaust. - At low revs there is little to no difference in exhaust note (I was surprised by this). In the end the front pipe has only been tested by PRL so far as I know. Display results as threads I heard good things about the RV6, but 3 reasons why I'm not interested, 1. Whatsup 9thgens, I got a 14 Si and need some opinions. Discussion in 'Exhaust & Downpipes' started by spdandpwr, Sep 26, 2012. Home Forums > Civic Technical > Bolt-Ons And All Motor > Exhaust & Downpipes > Downpipe/FP question Discussion in ' Exhaust & Downpipes ' started by K24RippiniT , Oct 5, 2017 . Or net any gain? However, Vits turbo upgrade or big turbo, that’s where the 3 inch downpipe/front pipe and catback exhausts ( and other bolt ons ) will shine the most. stock pipe is enough for the reduced volume. This platform makes the power from the tune itself, using higher octane fuel, or blends with E85. RV6 Catted Downpipe/Front pipe now available! 3" dp to 2.75" exhaust is fine, minimal difference in power like Meesh said. 8th gen civic si stock exhaust on 9th gen civic lx. Here goes on my impressions of the downpipe (I ran the cat-less for a couple weeks and now have the high-flow cat version). Full-Race 9th Gen Civic Si and Acura ILX V-band Exhaust System. I am personally going to stick with the version with the cat as the cat-less didn't pass the wife test with the odor. So, looking at the stock downpipe and front pipe, I notice a few things. - At higher revs, there is a some rasp and it is louder, but only slightly. As exhaust gases leave the combustion chamber, it starts cooling down and thus decrease in volume. Then again it's a crapshoot whether you will be able to get the downpipe to work without a tuner to disable an O2. No type of leakage or anything to worry about. Or just downpipe? The reason I'm asking is because aFe says this exhaust adds 10 additional whp to a stock Si. You must log in or register to reply here. ). Need to see a company come out with a cat delete downpipe in stock size and see what happens. Once tuned though i'll have them just turn off the second O2. Downpipe + Frontpipe? - Across entire rpm range there is no rasp and is very close to stock in terms of sound. 2010 Lexus IS 350 Sport, 2006 Toyota Camry SE V6, 2013 Toyota Sienna, 2018 Honda ... the exhaust wont benefit becuase you have smaller piping with the stock downpipe and front pipe. - As with any cat-less setup it stinks (the exhaust gases). Something about Dyno Dynamics brand of dynos being heart-breakers. No! Newer Than: Search this forum only. JavaScript is disabled. Our stock turbo is the reason for all this. always thought those were under the car at least they were on all my cars i drove in the past. Full-Race Honda 9th Gen Civic Si 3" All-Motor Downpipe Features: 304 stainless steel construction; Mandrel bent, large radius bends; Precision TIG welded and purged; CNC'd oxygen sensor bungs "This is a YouTube video of the difference between normal exhaust and the catted downpipe/full exhaust." I've read that the replacing the stock downpipe and frontpipe will allow our Civics to gain horsepower. The downpipe (cat) and front pipes that replace our stock ones are larger in diameter (2.5" to 3") than the stock one (2"). I’ll say this, most bolt ons are not pointless, definitely not pointless but they should not be prioritized. The stock downpipe (cat) has a large opening and goes down to a smaller opening. Messages: 5 Location: Panama City, Panama. is that the catalytic converter on the front pipe? A forum community dedicated to 9th generation Honda Civic owners and enthusiasts. I think the Si tuned with the stock exhaust without a cat would make basically the same gains as one that’s full bolt ons. I have the full race 3 in downpipe catted with my stock exhaust and it fits just fine.

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