I'm going to begin autocrossing more heavily this year than any other year. I was wondering if anybody had any recomendations for exhust systems. Its got to meet SCCA stock class rules. I dont care if its loud or not, I just want the best exhaust you can get.

 

Check your local autoX rules some have db limits on exhausts.

 

You can run cut outs so I'm guessing they dont care.

 

Generally for auto-x, any system that retains the cat will be legal for Stock class. After that, the best system is the one that weighs the least.
Power gains by exhaust are almost insignificant in an auto-x enviroment.

 

Good point, I was doing some research and found that Spoon makes the lightest one, but its also one of the most expensive. I was considering getting mugen, comptech or spoon. What do you think.

 

not sure if its light or not, but when i put the tanabe super racing medallion on my car, i gained more power than i ever expected, just some food for thought

 

Fujitsubo RM-01A gets my vote.

 

Where did you buy the Fujitsubo exhaust from. Also what are some specs on the exhaust all i could find was info written in japaneese.

 

There is a problem with the Fujitsubo RM-01A for autox stock classes:

You have to keep everything from the cat forward stock.

Problem: The Fujitsubo has a JDM-length b-pipe. This is 3-4 inches LONGER than the ITR stock bpipe and the mugen twinloop b-pipe, etc. Most 'jdm' brand exhausts come as JDM and USDM length... this is one of the only ones that is only available with the JDM length bpipe.

One member of honda-tech actually cut the Fuji bpipe and had a flange welded on to fit it to the stock cat. After spending $750+ dollars on an exhaust, the last thing I wouild want to do is hack it up, but if D stock is that big a deal to you and you NEED an exhaust and are willing to do this - its probably worth it. It is very light compared to the stock system (I'll have a weight comparison in a few weeks) and I made 8whp on the dyno just front swapping out the stock cat/stock exhaust for the Fujitsubo and an appropriately sized cat. (larger diameter)

Just be aware that if you were to get the exhaust, and try to bolt it up, it would NOT fit with the stock cat.

 

Yea I like the Fujitsubo but the whole cutting thing doesnt sound that good. The Spoon exhaust is still lighter than the Fujitsubo.

Exhaust B-Pipe Data (Integra Type R)

Pipe Diameter (OD) Flow Rate Weight
Spoon 60.5mm (2.38") 135l/sec 5.9kg(13lbs)
Stock 57.2mm (2.25") 115l/sec 8.8kg(19.4lbs)

N1 Muffler Data (Civic Type R / Integra Type R)

Pipe Diameter (OD) Flow Rate Weight
Spoon 60.5mm (2.38") 139l/sec 3.6kg (7.9lbs)
Stock 57.2mm (2.25") 112l/sec 8.5kg (18.7lbs)

http://aj-racing.com/spoon-sports/integra-inex.html

When the Fujitsubo exhaust weighs 11.2kg.

http://www.fujitsubo.co.jp/search/pr...namID=00000150