PART NUMBER: 61-2347
The ONLY custom designed downpipe with full 5 inch body highflow converter that is ever likely to exist. Over a YEAR of work, but it takes time to make the BEST FLOWING FIAT 124 Downpipe!
Every other choice on the market is 4 inch body, this 5 inch body design flows massively better. The math tells you the big news here: area of a 4 inch circle is 12.6 square inches, area of a 5 inch circle is 19.63 square inches, which means our 5 inch body SportCat flows nearly 60% better than a 4 inch design! Starting from scratch and laser scanning the space meant we could CAD and custom manufacture a full 5 inch body converter. 200 CPI Metallic Stainless Steel Body. Bolt on fit to RoadsterSport Brand Exhaust Systems. Includes ability to bolt on the factory heat shields from the factory converter for a finished appearance and stock levels of protection of the painted tunnel area below the turbo.
A bit over a pound less weight than stock unit.
YES Tune required to get AFR right with this highflow unit, Tork MotorSports and OpenFlash Tablet tunes are the only tunes we have tested to work with this item and only the OpenFlash Tablet actually has log functions so you can send the Tuner back a log to double check Air/Fuel ratios are correct. Warranty is one year, only for those using tunes named above that we have tested as compliant with correct AFR values with this unit. Year 2020 update, we now have purchased a complete EC tune, largely for the purpose of working with them to better dial the tune for accurate AFR with the Sportcat. The process included numerous driving logs submitted back to EC so they could better dial the tune to match the flow of a Fiat 124 that has one of our complete 2.5 inch exhaust systems with Crosspipe (2.25 or 2.5) and plus the SPORTCAT. Toby at EC was very easy to work with, and now knows more what the tune needs for customers with our complete setups, but you still need to log the tune and get him a log so he can adjust your tune as needed (there are various devices on the market that plug into the OBDII port for scanning, including some that are bluetooth and can log that data direct to your cell phone).
Designed to be used with our complete RoadsterSport exhaust systems, including slightly larger than stock 2.25 outlet from downpipe that matches up with our 2.25 and 2.5 Crosspipes. Stock Crosspipe is a crime against horsepower with crunch bends down to about 1.6 inches, so max benefit comes from cleaning up the flow all the way with our complete RoadsterSport Exhaust Systems (see dyno in our forum with our Fiat 124 now making over 240 Ft/Lbs torque at the wheels!).
Stock downpipe converter is a 'two biscuit' design, or two cores, each about 4 inches long. First stock core after the turbo is the highest density, appears to be at least 400 CPI, second core is lower density CPI. Ours is a motorsports grade metallic single core of 5 inch diameter and 200 CPI for much less backpressure, much faster turbo spool.
HEAR IT...with our Complete RoadsterSport Exhaust System. That means our RoadsterSport Highflow 5 inch body SportCat, plus RoadsterSport 2.5 inch Crosspipe, plus RoadsterSport 2.5 inch Midpipe, plus RoadsterSport 2.5 inch Muffler Delete. This is our RoadsterSport Complete Exhaust System with midpipe resonator included, because that is how it passes SCCA sound limits at venues with 91 and 93 db limits!
NOTE on PO420 Codes for catalyst efficiency. Use of any highflow cat includes risk of PO420 codes as normal. The car has two O2 sensors, one before and one after the converter. Those sensors are measuring the delta of oxygen before and after the converter and comparing to set table of values in the ECU. Thus, in moving to higher flowing converter with much less core density that delta of before to after measured will be below stock delta the moment you install the higher flowing converter and that means the sensitivity to codes goes way up! Very cold weather will increase odds of cat efficiency codes, because the lower density core won't heat as fast as stock cat does. Track/Autocross use will also increase odds of code, because of sustained high speed gas movement through the core. If you are the type to worry about such codes, a highflow converter is likely not for you (your Tuner may be able to shut them off for you). Also must add it pretty pointless to add this item to car on otherwise stock exhaust, particularly with stock crosspipe (this intended as an 'icing on the cake' track user item after already adding our complete RoadsterSport exhaust systems).
INSTALLATION NOTES: Find the "Installation Instructions" section of our forum, thread "Fiat 124 SportCat Installation Notes". This install likely done best by professionals, but lots of pictures are provided and a really good shadetree mechanic can do it with the pictures provided.BRIAN'S ADDITIONAL APPLICATION NOTES: Adding any highflow downpipe will add some drone to the final sound, the stock high density converter is good at stopping flow and drone, so when we open it up the drone goes down the pipes and you will hear a lot more of it. Our RoadsterSport systems were developed before the SportCat, after we developed the Sportcat and learned about the additional drone we started over with our budget 'SYSTEM ONE' exhaust that includes a special Helmholtz resonator to control drone. Thus, customers never considering a downpipe may want the RoadsterSport for its use of highest quality 300 stainless throughout, and those who might consider SportCat should seriously consider the new SYSTEM ONE for that special Helmholtz resonator.