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Old 06-17-2009, 03:34 PM #1  
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New IS-F Exhaust by ISS Performance

So this is our prototype exhaust for the new IS-F. It is a Quad Muffler Exhaust System with full mandrel bend stainless piping. The Dyno numbers came in at 365 HP and 334 TQ. The base we are going on was 332 HP.

Let me know what you think.







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Old 06-17-2009, 05:26 PM #2  
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Typical gains from an exhaust are 20-25 rwhp, what did you guys do differently to achieve 33 rwhp gain? The exhaust looks great from behind, any under car pics?
Peter
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Old 06-17-2009, 05:31 PM #3  
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We reduced flow restriction, added an x pipe, created a quad muffler system and the rest just happen.

Thanks
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Old 06-17-2009, 05:32 PM #4  
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Here is the Dyno sheet

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Old 06-17-2009, 09:50 PM #5  
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one thing i hate about the ISF are the stacked oval exhaust pipes......i like this quad setup a lot better, and the gains are huge!

any under-car pics? or off the car? id like to check it out.
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Old 06-17-2009, 10:11 PM #6  
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Old 06-17-2009, 10:12 PM #7  
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It's a prototype so the finished product is going to be in polished stainless and tig welded. We will also offer a ceramic coated option.
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Old 06-17-2009, 10:25 PM #8  
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How is the exhaust note? The stock isf can sound pretty beastly so this must be awesome.
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Old 06-17-2009, 10:33 PM #9  
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Check this link out. It's not the best video but you can get a good idea of what it sounds like.

http://www.flickr.com/photos/issperf...7619798744647/
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Old 06-18-2009, 12:10 PM #10  
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Good job guys. Impressive gains.
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Old 06-18-2009, 02:44 PM #11  
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Thanks Andy. As soon as we finish the final product I'll take it by your shop.
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Old 06-18-2009, 05:47 PM #12  
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Here is a video... Not the best but you can hear what the exhaust sounds like.

http://www.flickr.com/photos/issperformance/3639929766/

Some more pics.





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Old 06-19-2009, 10:44 AM #13  
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What were the SAE corrected numbers (smoothing 5)? We all know that the STD correction factor artificially inflates the dyno numbers.

Peter
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Old 06-19-2009, 11:13 AM #14  
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That's why we're claiming 25 to 30 HP increase. You know under promise over deliver. Not trying to go for the full 33hp shown on the dyno sheet.
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Old 06-19-2009, 01:37 PM #15  
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So what were the SAE corrected numbers at 5 smoothing...
Peter
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