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Discussion Starter · #1 ·
I think it’s pretty well understood that a quality aftermarket exhaust system will provide improved sound, airflow, and just plain ol’ aesthetic appeal. I’d like to focus on the airflow side of things. Where exactly is the improved air flow coming from? Are the head pipes simply a larger diameter than the OEM pipes? Or is the improved flow mainly coming from scrapping the restrictive factory muffler/cat? Now I’m aware that company’s like V&H and Cobra design their head pipes to improve exhaust gas scavenging and things like that. That being said…IF the majority of improvement is coming from replacing the OE muffler/cat then wouldn’t the Cobra Slip-on yield similar performance gains as a full system when coupled with an air breather and fuel processor?
 

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Yes Bro- You got it!!
 

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I wouldn't expect any improvement in air flow or performance gains from replacing or making any changes to the exhaust only. The Stryker air box is a maze; I count no less than 5 directional changes air must make before it reaches the throttle bodies. Exhaust modifications will be effective only after addressing intake and fuel metering.
 

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Discussion Starter · #4 ·
trigger said:
I wouldn't expect any improvement in air flow or performance gains from replacing or making any changes to the exhaust only. The Stryker air box is a maze; I count no less than 5 directional changes air must make before it reaches the throttle bodies. Exhaust modifications will be effective only after addressing intake and fuel metering.
i understand that...if you notice in my OP I'm comparing the flow benefits of a slip-on as apposed to a full system assuming you've already upgraded the air-box and fuel tuning.
 

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assuming you already opened the air box and added a tuner you are only getting half the benefit by doing so you have all this air coming in but still restricted coming out by changing the exhaust you are allowing the air to get out and allowing the engine to breath better cause it's no longer restricted. Now you could just change to a K&N type of air filter and leave it and notice a nice increase in hp and you would not have to go out and buy a new exhaust of coarse unless you wanted to.
 

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In my experience with aftermarket slip-on's (no other mods)I noticed reduced mid-range, significant loss of top end power and the pipes and slip-on's began to turn yellow. This was with an 1100 Vstar and I switched to HK equalizers, intake mods and complete re-jetting. In hind sight, I should have increased the main jets a size or 2 and lifted the needles .5 mm with the slip-on's. I've also become a believer in sonic wave disruption or smart baffles in all after-market pipes.
I haven't done any engine mods to the Stryker as yet because the V&H big radius pipes are not yet available in black; the cobra auto-tune processors seem to be in short supply and I have some unanswered questions about the ability of the stock ECM to over-ride the auto tune below about 3000 RPM.
 

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on my last bike the slipons were just for sound and show but im not quite sure about the airflow comparison on the stryker stock exhaust
 

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I would like to put on a slipon with out the big money and gas milage. I previously owned 06 streetglide WITH d&d fatcat 2into1,power commander, ness big sucker air filter and I had it dyno-tuned= 81 hp and 1600$ and less mile per gallon. I was hoping I could find a slip-on with out having to go through all that.
 
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