It's a good idea to do the MotorDyne Spacer/MREV2 first, if you're not getting the needed air in the ART pipes won't be as effective. Tony at MD claims 20 HP & 30 lb-ft torque with is combo, that's impossible to beat with any other bolt on! Save your $$ and do it right....
Gary

 

My final verdict on the spacer is when I get it I'm going with the MREV2 + 1/2" (iso)spacer. Ill do this right before dyno tuning as I've heard about some poeple having lean spots after these mods.

 

What kind of numbers does the HR y-pipe do for a stock rev-up 6MT?

 

I love these two combo. This was the first mod i did. Was all worth it. Really fun for daily driving.

 

For 05 rev-up 6mt it does around 6-7whp(about 8-9hp at engine)..on our 2006's it may be 1whp better due to our improved intake box.
The z-tube and k&n have been known for 3-4whp(about 5-6 hp at engine). If you add it up its like having the revised 306hp engine. The 298hp engine after the revised ratings is apparently 293hp stock.
293hp + 5hp(ztube/k&n panel filter) + 8hp(350z HR Y-pipe = 306hp.

ART pipes have shown atleast 9whp gains so about 11hp at engine of 6mt 05-06 rev-up's. About 317hp- 320hp untuned assuming there are no lean spots(lean=detonation=ecu retards timing and gains are losses if fuel isn't added in maps). Tuned with the setup is probably 325hp or so..mightly close to thr mighty HR that has very similar torque as well.

 

Thanks for the great info. I'll have to search more on what vehicles are compatible with the 06 coupes.