mikh338

iTrader: (16)

just so you know the tsp 1 7/8 are a 1 3/4 inside diameter just like the 1 3/4 you alredy had. i found this out the hard way and sold them

greenvortec97

iTrader: (1)

what did you measure with?

06Sierra2

There was a thread about this awhile back, arent the primaries measured all the way across to the outside? what did ur 1 3/4 measure acrossed?

redbird555

iTrader: (14)

^^^exactly every header is measured to the outside of the tubes so 1-3/4 are actually less than that i.d and 1-7/8 are less than 1-7/8 i.d.... does matter the brand the tsp's were fine

adamantium

iTrader: (3)

Not all companies to my understanding. Most but not all. It depends on the company. Hooker headers 1 7/8 IIRC are measured ID hence why they have a 3.5" collector.

redbird555

iTrader: (14)

I have yet to see them. ARH, KOOKS, TSP, Pacesetter, Grotoyohann, BBK, Edelbrock, even EBAY are all measured that way. As far as I know its the standard...Exhaust ubing is measured I.D which is why your 3" y pipe will slide OVER your 3" header collector. I haven't seen hookers in person but I'm 99% positive they would be mesured the same way. Edelbrocks also have a 3.5 collector and are def measured to the O.D ask some sponsors to confirm

mikh338

iTrader: (16)

really? thats why we measured our pacesetter 1 3/4 and they were 1 3/4 on the inside, same as a set of kooks my buddy has which were 1 7/8 and i think a set of qtp(could be wrong) but they measures inside 1 3/4 as they claim.

mikh338

iTrader: (16)

yes i started the thread bc i was pissed my brand new tsp 1 7/8 measured the same inside as mine and my buddys pacesetter 1 3/4

redbird555

iTrader: (14)

where did you measur exactly? Its hard to measure at the collector or flange because those holes are enlarged to allow the pipes to fit inside them so you will naturally get a larger measurement. My buddies pacesetters were just under 1.75 i.d in the actual tubes and same with the case of a set of kooks I looked at. My 1-7/8" arh measured 1.82" i.d. You can call the header companies to verify but header primaries are usually measured to the outside while exhaust tube is measured i.d.

Refers to tsp's post about pacesetters and kooks.
https://ls1tech.com/forums/generatio...-diameter.html

one more
http://www.centuryperformance.com/fo...ing-and-Length


Your tsps were probably fine but just for future info

Chantro

iTrader: (1)

Just seen this thread, what were your dyno numbers?

G Atsma

You MIGHT get an answer.....

Chantro

iTrader: (1)

Yeah I know man lol. I seen he was on here a few weeks ago, so I thought why not. I'm basically building the same engine.