| Far as I'm concerned they are the best that SLP put out. Like you I'm not overly impressed with the latest style of SLP runner. IMHO they need work out of the box but have a lot of potential.
The first style is what I'm running on my car and I siamesed the other side pretty much all they way save maybe 2" that I could not get to. Dyno numbers and times in my signature. TPI rules.
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Best et of 12.12 and best mph of 111.27 mph. Motor specs as follows: 355ci, Dart Pro One 200cc heads, 10.72:1 compression, 8.5:1 dynamic compression ratio, TPI with highly modified 1st style SLP runners, moded GM plenum and First Injection TPI intake manifold, Mike Jones 228/228 cam, Yank SS3600 converter, Dyno Don 1 3/4" shorty headers with excellent Dyno Don custom exhaust, custom cold air intake, AS&M monoblade throttle body. Race weight 3760 with driver. Meziere electric water pump. Mufflex 3.5" exhaust catback. Magnaflow 3.5" muffler#12909. Kevin91Z Tune. 4L60E installed.
Standard correction/unlocked 380RWHP, 371 RWTQ. SAE numbers are 370RWHP, 361RWTQ. Switched to MAP. At the motor that is 462HP SAE.
A 370 cubic inch motor based on the Dart SHP block is under construction. Using AFR 195cc Comp Heads. | 
